{"schemaVersion":3,"id":"CVE-2026-59357","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Insufficient verification of data authenticity (CWE-345) in the external OIDC login callback in Cloud Foundry UAA v4.5.0 to v79.6.0 (inclusive) allows an authenticated UAA user to bypass the OAuth authorization-code exchange and establish an authenticated external-OIDC browser session, via submitting a UAA access token or a cross-client ID token as the callback’s id_token parameter.\n\n\n\nThe issue only manifests when a UAA zone is configured with an OIDC identity provider whose issuer exactly matches that zone’s own /oauth/token endpoint (a “self-UAA” OIDC configuration). In this configuration, the callback takes a supplied id_token directly instead of requiring the authorization code exchange, and does not verify that the token was actually issued as an ID token for the specific self-OIDC relying-party client. An attacker holding any valid UAA JWT for themselves — including a plain access token with only uaa.user scope, or a valid ID token issued to an unrelated client such as cf — can present it as the callback’s id_token and be authenticated into a mapped local (“shadow”) account. Because the resulting session is not verified against the originating token’s true audience or user_id, its effective privilege depends entirely on the shadow account’s group memberships, which can include administrative scopes such as clients.write.\n\n\n\nExploitation requires a valid UAA user JWT, a valid browser login state for the target zone, and the presence of a self-referential OIDC provider configuration — this is not a pre-authentication vulnerability, and does not by itself grant privileges beyond those already held by the mapped shadow account.","dates":{"published":"2026-10-06T07:06:18.486Z","modified":"2026-10-06T11:49:21.187Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.5,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.5,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00185,"percentile":0.0762,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-06T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00185,"percentile":0.0762}],"last30":[{"date":"2026-10-06T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00185,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00185,"percentile":0.0762}]},"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-345","name":"Insufficient Verification of Data Authenticity","description":"The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/345.html"}],"affected":[{"vendor":"cloud foundry","product":"cf-deployment","name":"cf-deployment","label":"cf-deployment","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 60.4.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 60.4.0","eol":null,"hubHref":"/vendor/cloud_foundry/cf-deployment"},{"vendor":"cloud foundry","product":"uaa","name":"UAA","label":"uaa","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.5.0, ≤ 79.6.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.5.0, ≤ 79.6.0","eol":null,"hubHref":"/vendor/cloud_foundry/uaa"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.cloudfoundry.org/blog/cve-2026-59357-self-uaa-oidc-configuration-allows-jwt-injection-to-establish-unauthorized-sessions/","label":"www.cloudfoundry.org/blog/…","hostname":"www.cloudfoundry.org","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-06T07:06:18.486Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-06T11:49:21.187Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":26,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T23:47:40.175Z","stale":false,"partial":false}}