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CVE-2026-35208— lichess.org has an Unsanitized Stream Title Injection on /streamer

Quick assessment

Affected
lichess-org lila
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

lila是Lichess开源的一个无广告和开源的国际象棋服务器。 lila存在安全漏洞，该漏洞源于允许已批准主播注入任意HTML，可能导致服务器端HTML注入。

AI Predicted 6.1 Difficulty: Easy EPSS 0.35% · P28
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I. Basic Information for CVE-2026-35208

Vulnerability Information
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Vulnerability Title
lichess.org has an Unsanitized Stream Title Injection on /streamer
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
lila 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lila是Lichess开源的一个无广告和开源的国际象棋服务器。 lila存在安全漏洞，该漏洞源于允许已批准主播注入任意HTML，可能导致服务器端HTML注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lichess-org lila < 0d5002696ae705e1888bf77de107c73de57bb1b3 -

II. Public POCs for CVE-2026-35208

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III. Intelligence Information for CVE-2026-35208

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Patches & Fixes for CVE-2026-35208 (1)

Vendor Advisories for CVE-2026-35208 (1)

IV. Related Vulnerabilities

Same product: lila
Same vendor: lichess-org
Same weakness: CWE-79

V. Comments for CVE-2026-35208

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