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CVE-2026-35208

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9f0a9f4844331bf685472c4f8b0761370f159c1f76eabb87644ed97d615d8a63
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"lila","vendor":"lichess-org","versions":[{"status":"affected","version":"< 0d5002696ae705e1888bf77de107c73de57bb1b3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/lichess-org/lila/commit/0d5002696ae705e1888bf77de107c73de57bb1b3","tags":["x_refsource_MISC"],"url":"https://github.com/lichess-org/lila/commit/0d5002696ae705e1888bf77de107c73de57bb1b3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/references/1
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/references/0
{"name":"https://vimeo.com/1175908262","tags":["x_refsource_MISC"],"url":"https://vimeo.com/1175908262"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:87f3d187b2628b68778296b9fc12edcc2370193269fa3cac72b684faa1a47f0d · sha256:9b3c013644042ce9… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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