{"schemaVersion":3,"id":"CVE-2026-7571","aliases":["CGA-299g-m4c2-j7fc","CGA-684p-3jv5-qh2j","CGA-8xgq-vr45-5832","CGA-cr5p-rf29-mqwv","CGA-v5pv-c24q-hh68","CGA-vf33-mxqv-v24g","CGA-vq59-fxp3-wcw6","CGA-xcj9-58vw-2qcj","CGA-22cm-xw32-v43x","CGA-4m5v-qjh4-f938","CGA-4rw2-gxr6-rhgq","CGA-5c64-3crv-mfhr","CGA-5hcc-3xr7-fr6r","CGA-6398-jxf8-p9qv","CGA-73m4-qv7m-6crc","CGA-7j8j-7fw5-fqg2","CGA-93gq-j6qf-j8wv","CGA-9j6g-j8r6-6g74","CGA-f2hw-25c9-6w5g","CGA-gr44-595v-pmjq","CGA-mvpf-cwxq-g87r","GHSA-hq3p-w4xv-x7vp","BIT-keycloak-2026-7571","CGA-w38q-69qh-3gg4","CGA-wqhc-cxgp-645f","CGA-xh7x-548h-5pfw"],"status":"published","duplicateOf":null,"title":"Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data","description":"A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.","dates":{"published":"2026-05-19T11:01:26.987Z","modified":"2026-05-20T16:08:52.363Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Wolfi","score":7.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","exploitability":7.2,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Chainguard","score":7.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","exploitability":7.2,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Maven","score":7.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","exploitability":7.2,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00503,"percentile":0.42138,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.15899999999999997,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00344},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00503,"percentile":0.42138}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00344,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00417,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00503,"percentile":0.42138}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-472","name":"External Control of Assumed-Immutable Web Parameter","description":"The web application does not sufficiently verify inputs that are assumed to be immutable but are actually externally controllable, such as hidden form fields.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/472.html"}],"affected":[{"vendor":"chainguard","product":"keycloak-26.4","name":"keycloak-26.4","label":"keycloak-26.4","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-26.4","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"keycloak-26.4-iamguarded-compat","name":"keycloak-26.4-iamguarded-compat","label":"keycloak-26.4-iamguarded-compat","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-26.4-iamguarded-compat","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"keycloak-26.5","name":"keycloak-26.5","label":"keycloak-26.5","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-26.5","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"keycloak-26.5-iamguarded-compat","name":"keycloak-26.5-iamguarded-compat","label":"keycloak-26.5-iamguarded-compat","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-26.5-iamguarded-compat","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"keycloak-fips-26.4","name":"keycloak-fips-26.4","label":"keycloak-fips-26.4","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-fips-26.4","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"keycloak-fips-26.4-iamguarded-fips","name":"keycloak-fips-26.4-iamguarded-fips","label":"keycloak-fips-26.4-iamguarded-fips","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-fips-26.4-iamguarded-fips","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"keycloak-fips-26.5","name":"keycloak-fips-26.5","label":"keycloak-fips-26.5","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-fips-26.5","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"keycloak-fips-26.5-iamguarded-fips","name":"keycloak-fips-26.5-iamguarded-fips","label":"keycloak-fips-26.5-iamguarded-fips","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-fips-26.5-iamguarded-fips","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"request-9047-keycloak-fips-26.4","name":"request-9047-keycloak-fips-26.4","label":"request-9047-keycloak-fips-26.4","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/request-9047-keycloak-fips-26.4","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"request-9047-keycloak-fips-26.4-iamguarded-fips","name":"request-9047-keycloak-fips-26.4-iamguarded-fips","label":"request-9047-keycloak-fips-26.4-iamguarded-fips","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/request-9047-keycloak-fips-26.4-iamguarded-fips","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"request-9047-keycloak-fips-26.5","name":"request-9047-keycloak-fips-26.5","label":"request-9047-keycloak-fips-26.5","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/request-9047-keycloak-fips-26.5","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"request-9047-keycloak-fips-26.5-iamguarded-fips","name":"request-9047-keycloak-fips-26.5-iamguarded-fips","label":"request-9047-keycloak-fips-26.5-iamguarded-fips","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/request-9047-keycloak-fips-26.5-iamguarded-fips","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"wolfi","product":"keycloak-26.4","name":"keycloak-26.4","label":"keycloak-26.4","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/keycloak-26.4","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"wolfi","product":"keycloak-26.4-iamguarded-compat","name":"keycloak-26.4-iamguarded-compat","label":"keycloak-26.4-iamguarded-compat","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/keycloak-26.4-iamguarded-compat","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"wolfi","product":"keycloak-26.5","name":"keycloak-26.5","label":"keycloak-26.5","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/keycloak-26.5","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"wolfi","product":"keycloak-26.5-iamguarded-compat","name":"keycloak-26.5-iamguarded-compat","label":"keycloak-26.5-iamguarded-compat","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/keycloak-26.5-iamguarded-compat","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"org.keycloak","product":"keycloak-services","name":"org.keycloak:keycloak-services","label":"keycloak-services","ecosystem":"Maven","cpePart":null,"purl":"pkg:maven/org.keycloak/keycloak-services","purlType":"maven","versions":[{"text":"< 26.6.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 26.6.2","eol":null,"hubHref":null},{"vendor":"redhat","product":"build_of_keycloak","name":"build of keycloak","label":"build_of_keycloak","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 26.4, < 26.4.12","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 26.4, < 26.4.12","eol":null,"hubHref":"/vendor/redhat/build_of_keycloak"}],"affectedCount":18,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:19596","label":"access.redhat.com/errata/RHSA-2026:19596","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT","WEB"]},{"url":"https://access.redhat.com/errata/RHSA-2026:19597","label":"access.redhat.com/errata/RHSA-2026:19597","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT","WEB"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-7571","label":"access.redhat.com/security/cve/CVE-2026-7571","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","WEB","Vendor Advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2464263","label":"bugzilla.redhat.com/show_bug.cgi?id=2464263","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT","WEB","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7571","label":"nvd.nist.gov/vuln/detail/CVE-2026-7571","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/keycloak/keycloak/issues/49110","label":"github.com/keycloak/keycloak/issues/49110","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/keycloak/keycloak/pull/49120","label":"github.com/keycloak/keycloak/pull/49120","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/keycloak/keycloak/commit/56bbfa3d8abccf39df787ae73e044a75aba1da13","label":"github.com/keycloak/keycloak/commit/56bbfa3d8abccf39df787ae73e044a75aba1da13","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/keycloak/keycloak","label":"github.com/keycloak/keycloak","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://github.com/keycloak/keycloak/releases/tag/26.6.2","label":"github.com/keycloak/keycloak/releases/tag/26.6.2","hostname":"github.com","tags":["WEB"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-05-19T11:01:26.987Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-05-20T16:08:52.363Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":29,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T17:53:09.165Z","stale":false,"partial":false}}