{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81888", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-27T17:48:42.123Z", "datePublished": "2026-08-31T20:27:33.165Z", "dateUpdated": "2026-09-01T14:59:01.902Z"}, "containers": {"cna": {"title": "@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking", "problemTypes": [{"descriptions": [{"cweId": "CWE-352", "lang": "en", "description": "CWE-352: Cross-Site Request Forgery (CSRF)", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1275", "lang": "en", "description": "CWE-1275: Sensitive Cookie with Improper SameSite Attribute", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q"}, {"name": "https://github.com/honojs/middleware/pull/2040", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/middleware/pull/2040"}, {"name": "https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1"}, {"name": "https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6"}], "affected": [{"vendor": "honojs", "product": "@hono/oauth-providers", "versions": [{"version": "< 0.8.6", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-31T20:27:33.165Z"}, "descriptions": [{"lang": "en", "value": "@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."}], "source": {"advisory": "GHSA-fm3f-ch8h-qw8q", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T14:15:08.751502Z", "id": "CVE-2026-81888", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T14:59:01.902Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "@hono/oauth-providers", "vendor": "honojs", "versions": [{"status": "affected", "version": "< 0.8.6"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "@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."}], "id": "CVE-2026-81888", "lastModified": "2026-09-01T15:17:31.113", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-81888", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-01T14:15:08.751502Z", "version": "2.0.3"}}]}, "published": "2026-08-31T21:17:52.317", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/middleware/pull/2040"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-352"}, {"lang": "en", "value": "CWE-1275"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.8.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "@hono/oauth-providers", "source": "cna", "vendor": "honojs"}, "product": "@hono/oauth-providers", "vendor": "honojs"}], "created": "2026-08-31T21:45:04.640066+00:00", "updated": "2026-09-01T14:16:30.181349+00:00", "vendors": ["honojs", "honojs$PRODUCT$@hono/oauth-providers"]}