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CVE-2026-35208

lichess.org has an Unsanitized Stream Title Injection on /streamer

MEDIUM
5.4
CVSS Score
Published: April 6, 2026 at 08:06 PM UTC
Updated: July 24, 2026 at 09:20 PM UTC
2 products affected across 2 vendorsLilaLila

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Lila· Lichess
95%
v < 2026-03-31
Affected range stops below 2026-03-31, so it looks safe — our inference, not a vendor statement
Lila· Lichess Org
60%
v < 0d5002696ae705e1888bf77de107c73de57bb1b3

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMExploitVendor Advisory
Source: cverecord
https://github.com/lichess-org/lila/security/advisories/GHSA-v7gh-939r-pfjq
x_refsource_MISCPatch
Source: cverecord
https://github.com/lichess-org/lila/commit/0d5002696ae705e1888bf77de107c73de57bb1b3
x_refsource_MISCExploit
Source: cverecord
https://vimeo.com/1175908262

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79CWE-116

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