{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-35208","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-01T18:48:58.937Z","datePublished":"2026-04-06T20:06:25.821Z","dateUpdated":"2026-04-07T15:09:55.304Z"},"containers":{"cna":{"title":"lichess.org has an Unsanitized Stream Title Injection on /streamer","problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-116","lang":"en","description":"CWE-116: Improper Encoding or Escaping of Output","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"references":[{"name":"https://github.com/lichess-org/lila/security/advisories/GHSA-v7gh-939r-pfjq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lichess-org/lila/security/advisories/GHSA-v7gh-939r-pfjq"},{"name":"https://github.com/lichess-org/lila/commit/0d5002696ae705e1888bf77de107c73de57bb1b3","tags":["x_refsource_MISC"],"url":"https://github.com/lichess-org/lila/commit/0d5002696ae705e1888bf77de107c73de57bb1b3"},{"name":"https://vimeo.com/1175908262","tags":["x_refsource_MISC"],"url":"https://vimeo.com/1175908262"}],"affected":[{"vendor":"lichess-org","product":"lila","versions":[{"version":"< 0d5002696ae705e1888bf77de107c73de57bb1b3","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-06T20:06:25.821Z"},"descriptions":[{"lang":"en","value":"lichess.org is the forever free, adless and open source chess server. Any approved streamer can inject arbitrary HTML into /streamer and the homepage “Live streams” widget by placing markup in their Twitch/YouTube stream title. CSP is present and blocks inline script execution, but the issue is still a server-side HTML injection sink. To trigger this, a Lichess account only needs to satisfy the normal streamer requirements and get approved. Per Streamer.canApply, that means an account older than 2 days with at least 15 games, or a verified/titled account. After moderator approval, once the streamer goes live, Lichess pulls the platform title and renders it into the UI as-is. No extra privileges are needed beyond a normal approved streamer profile. This vulnerability is fixed with commit 0d5002696ae705e1888bf77de107c73de57bb1b3."}],"source":{"advisory":"GHSA-v7gh-939r-pfjq","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-07T14:55:58.549189Z","id":"CVE-2026-35208","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":"2026-04-07T15:09:55.304Z"}}]}}