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6 vulnerabilities by Lichess
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/lichess-org/lila/security/advi… | x_refsource_CONFIRM |
| https://github.com/lichess-org/lila/commit/0d5002… | x_refsource_MISC |
| https://vimeo.com/1175908262 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| lichess-org | lila |
Affected:
< 0d5002696ae705e1888bf77de107c73de57bb1b3
|
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CVE-2025-52186 (GCVE-0-2025-52186)
Vulnerability from nvd – Published: 2025-11-13 00:00 – Updated: 2025-11-13 17:18
VLAI
Summary
Lichess lila before commit 11b4c0fb00f0ffd823246f839627005459c8f05c (2025-06-02) contains a Server-Side Request Forgery (SSRF) vulnerability in the game export API. The players parameter is passed directly to an internal HTTP client without validation, allowing remote attackers to force the server to send HTTP requests to arbitrary URLs
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
2 references
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CVE-2025-48051 (GCVE-0-2025-48051)
Vulnerability from nvd – Published: 2025-05-15 00:00 – Updated: 2025-05-15 19:10
VLAI
Summary
powertip.ts in Lila (for Lichess) before ab0beaf allows XSS in some applications because of an innerHTML usage pattern in which text is extracted from a DOM node and interpreted as HTML.
Severity
4.7 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
Impacted products
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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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/lichess-org/lila/security/advi… | x_refsource_CONFIRM |
| https://github.com/lichess-org/lila/commit/0d5002… | x_refsource_MISC |
| https://vimeo.com/1175908262 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| lichess-org | lila |
Affected:
< 0d5002696ae705e1888bf77de107c73de57bb1b3
|
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CVE-2025-52186 (GCVE-0-2025-52186)
Vulnerability from cvelistv5 – Published: 2025-11-13 00:00 – Updated: 2025-11-13 17:18
VLAI
Summary
Lichess lila before commit 11b4c0fb00f0ffd823246f839627005459c8f05c (2025-06-02) contains a Server-Side Request Forgery (SSRF) vulnerability in the game export API. The players parameter is passed directly to an internal HTTP client without validation, allowing remote attackers to force the server to send HTTP requests to arbitrary URLs
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
2 references
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CVE-2025-48051 (GCVE-0-2025-48051)
Vulnerability from cvelistv5 – Published: 2025-05-15 00:00 – Updated: 2025-05-15 19:10
VLAI
Summary
powertip.ts in Lila (for Lichess) before ab0beaf allows XSS in some applications because of an innerHTML usage pattern in which text is extracted from a DOM node and interpreted as HTML.
Severity
4.7 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
Impacted products
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