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  4. CVE 2026 59830 discourse stored xss via unescaped actor name in
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Back to active CVEs
Medium · CVSS 5.4CVE-2026-59830

Discourse: Stored XSS via unescaped actor name in post actionsCVE-2026-59830

Answer in brief

CVE-2026-59830 records a Medium severity (CVSS 5.4) vulnerability in Discourse: Stored XSS via unescaped actor name in post actions. The current sources do not mark it as known exploited. The current feed maps discourse/discourse (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 Sep 21, 2026Updated Sep 23, 2026Source checked Nov 6, 2026First seen by HOL Sep 21, 2026Material review Sep 23, 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 discourse/discourse (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
discourse/discoursegeneric<2026.7.02026.7.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for discourse/discourse.
  2. 2Review the reported fix. Update discourse/discourse to 2026.7.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 21, 2026

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

  2. Source modified

    Sep 23, 2026

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

  3. First seen by HOL

    Sep 21, 2026

Sources and claim methodology

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

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action descriptions. Viewing the affected user activity streams could execute attacker-controlled script in another user's browser. This issue is fixed in version 2026.7.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Kubeflow Pipelines: Reflected XSS in the frontend pod information and events error responsesAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Nov 6, 2026
References
3 linked sources
Open source record