{"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": "2026-07-03T20:19:34.820Z"}, "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"}}}}

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