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  4. CVE 2026 103974 lichessorg stored html injection via pgn
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Back to active CVEs
Medium · CVSS 5.4CVE-2026-103974

lichess.org: Stored HTML Injection via PGN Annotator Tag in StudiesCVE-2026-103974

Answer in brief

CVE-2026-103974 records a Medium severity (CVSS 5.4) vulnerability in lichess.org: Stored HTML Injection via PGN Annotator Tag in Studies. The current sources do not mark it as known exploited. The current feed maps lichess-org/lila (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 14, 2026Updated Oct 14, 2026Source checked Oct 14, 2026First seen by HOL Oct 14, 2026Material review Oct 14, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps lichess-org/lila (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
lichess-org/lilageneric<c54596c9e1569d378fe20f80d4c790c6fdee54c4c54596c9e1569d378fe20f80d4c790c6fdee54c4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for lichess-org/lila.
  2. 2Review the reported fix. Update lichess-org/lila to c54596c9e1569d378fe20f80d4c790c6fdee54c4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 14, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

lichess.org is the forever free, adless and open source chess server. Prior to commit c54596c9e1569d378fe20f80d4c790c6fdee54c4, a user who can add a chapter to a study can place attacker-controlled text in the PGN Annotator tag, which becomes Comment.Author.External and is returned verbatim by authorText. When a study node has at least two comments, ui/analyse/src/treeView/inlineView.ts interpolates that author string into HTML passed to the innerHTML hook without escaping it. Opening the affected study can therefore render stored attacker-controlled HTML and CSS for other viewers, including navigation to an attacker-controlled site, content spoofing, and CSS-based data exposure, although the site's content security policy blocks injected JavaScript. This vulnerability is fixed by commit c54596c9e1569d378fe20f80d4c790c6fdee54c4.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • DataEase Datasource/Dataset Folder Name Stored Cross-Site ScriptingAlso CWE-79
  • DataEase bar-horizontal Axis Label Tooltip Stored Cross-Site ScriptingAlso CWE-79
  • Markdown Preview Enhanced: Stored XSS via Unsanitized `.crossnote/head.html` Injection in WebviewAlso CWE-79
  • PAN-OS: Denial of Service (DoS) Vulnerabilities in Network ServicesSame generic ecosystem
  • BentoPDF: SSRF via DNS Rebinding (TOCTOU) in Cloudflare CORS Proxy WorkerSame generic ecosystem
  • CRLF header injection in vertx-mail-client allows manipulation of outgoing SMTP messagesSame generic ecosystem

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 14, 2026
References
2 linked sources
Open source record