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    2 vulnerabilities by lichess-org

    CVE-2026-35208 (GCVE-0-2026-35208)

    Vulnerability from nvd – Published: 2026-04-06 20:06 – Updated: 2026-04-07 15:09
    VLAI
    Title
    lichess.org has an Unsanitized Stream Title Injection on /streamer
    Summary
    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.
    Severity
    5.3 (Medium)
    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
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-116 - Improper Encoding or Escaping of Output
    Assigner
    References
    Impacted products
    Vendor Product Version
    lichess-org lila Affected: < 0d5002696ae705e1888bf77de107c73de57bb1b3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-35208 (GCVE-0-2026-35208)

    Vulnerability from cvelistv5 – Published: 2026-04-06 20:06 – Updated: 2026-04-07 15:09
    VLAI
    Title
    lichess.org has an Unsanitized Stream Title Injection on /streamer
    Summary
    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.
    Severity
    5.3 (Medium)
    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
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-116 - Improper Encoding or Escaping of Output
    Assigner
    References
    Impacted products
    Vendor Product Version
    lichess-org lila Affected: < 0d5002696ae705e1888bf77de107c73de57bb1b3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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