{"schemaVersion":3,"id":"CVE-2026-81888","aliases":["GHSA-fm3f-ch8h-qw8q"],"status":"published","duplicateOf":null,"title":null,"description":"@hono/oauth-providers is Authentication middleware for Hono. Prior to version 0.8.6, the built-in social login providers accept an OAuth callback even when the `state` value is absent on both sides, so the anti-CSRF check passes for a callback that never came from a genuine login attempt. This defeats the `state`-based CSRF protection under default usage. Version 0.8.6 has a patch.","dates":{"published":"2026-08-31T20:27:33.165Z","modified":"2026-09-01T14:59:01.902Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.4,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Npm","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","exploitability":7.2,"impact":4.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00191,"percentile":0.08301,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.042,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00149},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00191,"percentile":0.08301}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00149,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00191,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00191,"percentile":0.08301}]},"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-352","name":"Cross-Site Request Forgery (CSRF)","description":"The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.","type":"weakness","status":"Stable","abstraction":"Compound","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/352.html"},{"id":"CWE-1275","name":"Sensitive Cookie with Improper SameSite Attribute","description":"The SameSite attribute for sensitive cookies is not set, or an insecure value is used.","type":"weakness","status":"Incomplete","abstraction":"Variant","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/1275.html"}],"affected":[{"vendor":"honojs","product":"@hono/oauth-providers","name":"@hono/oauth-providers","label":"@hono/oauth-providers","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 0.8.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.8.6","eol":null,"hubHref":"/vendor/honojs/honooauth-providers"},{"vendor":"@hono","product":"oauth-providers","name":"@hono/oauth-providers","label":"oauth-providers","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/@hono/oauth-providers","purlType":"npm","versions":[{"text":"< 0.8.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.8.6","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q","label":"github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q","hostname":"github.com","tags":["X Refsource CONFIRM","WEB"]},{"url":"https://github.com/honojs/middleware/pull/2040","label":"github.com/honojs/middleware/pull/2040","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1","label":"github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6","label":"github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/honojs/middleware","label":"github.com/honojs/middleware","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-08-31T20:27:33.165Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-01T14:59:01.902Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":22,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T07:03:02.748Z","stale":false,"partial":false}}