{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-26247", "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2", "state": "PUBLISHED", "assignerShortName": "Gitea", "dateReserved": "2026-03-03T03:25:28.654Z", "datePublished": "2026-07-03T20:19:34.820Z", "dateUpdated": "2026-07-07T16:59:17.604Z"}, "containers": {"cna": {"title": "Gitea OAuth2 PKCE S256 challenges are not enforced during token exchange", "descriptions": [{"lang": "en", "value": "Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check."}], "affected": [{"vendor": "Gitea", "product": "Gitea Open Source Git Server", "versions": [{"version": "0", "lessThan": "1.25.5", "status": "affected", "versionType": "semver"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"cweId": "CWE-284", "description": "CWE-284", "lang": "en", "type": "CWE"}]}], "references": [{"url": "https://github.com/go-gitea/gitea/pull/36462", "name": "GitHub Pull Request #36462", "tags": ["patch"]}, {"url": "https://github.com/go-gitea/gitea/pull/36477", "name": "GitHub Pull Request #36477", "tags": ["patch"]}, {"url": "https://github.com/go-gitea/gitea/releases/tag/v1.25.5", "name": "Gitea v1.25.5 Release", "tags": ["release-notes"]}, {"url": "https://blog.gitea.com/release-of-1.25.5/", "name": "Gitea v1.25.5 Release Blog Post", "tags": ["release-notes"]}], "providerMetadata": {"orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2", "shortName": "Gitea", "dateUpdated": "2026-07-03T20:19:34.820Z"}, "credits": [{"lang": "en", "value": "Aisle Research", "type": "reporter"}], "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-07-07T16:21:34.783006Z", "id": "CVE-2026-26247", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-07T16:59:17.604Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-26247", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-07-07T16:21:34.783006Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-07T16:21:49.787Z"}}], "cna": {"title": "Gitea OAuth2 PKCE S256 challenges are not enforced during token exchange", "credits": [{"lang": "en", "type": "reporter", "value": "Aisle Research"}], "affected": [{"vendor": "Gitea", "product": "Gitea Open Source Git Server", "versions": [{"status": "affected", "version": "0", "lessThan": "1.25.5", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://github.com/go-gitea/gitea/pull/36462", "name": "GitHub Pull Request #36462", "tags": ["patch"]}, {"url": "https://github.com/go-gitea/gitea/pull/36477", "name": "GitHub Pull Request #36477", "tags": ["patch"]}, {"url": "https://github.com/go-gitea/gitea/releases/tag/v1.25.5", "name": "Gitea v1.25.5 Release", "tags": ["release-notes"]}, {"url": "https://blog.gitea.com/release-of-1.25.5/", "name": "Gitea v1.25.5 Release Blog Post", "tags": ["release-notes"]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-284", "description": "CWE-284"}]}], "providerMetadata": {"orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2", "shortName": "Gitea", "dateUpdated": "2026-07-03T20:19:34.820Z"}}}, "cveMetadata": {"cveId": "CVE-2026-26247", "state": "PUBLISHED", "dateUpdated": "2026-07-07T16:59:17.604Z", "dateReserved": "2026-03-03T03:25:28.654Z", "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2", "datePublished": "2026-07-03T20:19:34.820Z", "assignerShortName": "Gitea"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Gitea Open Source Git Server", "vendor": "Gitea", "versions": [{"lessThan": "1.25.5", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "88ee5874-cf24-4952-aea0-31affedb7ff2"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check."}], "id": "CVE-2026-26247", "lastModified": "2026-07-07T18:16:37.327", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-26247", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-07T16:21:34.783006Z", "version": "2.0.3"}}]}, "published": "2026-07-03T21:16:58.417", "references": [{"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "url": "https://blog.gitea.com/release-of-1.25.5/"}, {"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "url": "https://github.com/go-gitea/gitea/pull/36462"}, {"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "url": "https://github.com/go-gitea/gitea/pull/36477"}, {"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "url": "https://github.com/go-gitea/gitea/releases/tag/v1.25.5"}], "sourceIdentifier": "88ee5874-cf24-4952-aea0-31affedb7ff2", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.25.5)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Gitea Open Source Git Server", "source": "cna", "vendor": "Gitea"}, "product": "gitea_open_source_git_server", "vendor": "gitea"}], "created": "2026-07-04T00:45:03.646056+00:00", "updated": "2026-08-01T20:30:12.086581+00:00", "vendors": ["gitea", "gitea$PRODUCT$gitea_open_source_git_server"]}