Medium · CVSS 5.3CVE-2026-53960

Discourse: Hidden first-post excerpt is emitted in Q&A schema JSON-LD

Answer in brief

CVE-2026-53960 records a Medium severity (CVSS 5.3) vulnerability in Discourse: Hidden first-post excerpt is emitted in Q&A schema JSON-LD. 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 Aug 17, 2026Updated Sep 18, 2026Source checked Oct 2, 2026First seen by HOL Aug 17, 2026Material review Sep 18, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.3. 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
Package	Affected range	Fixed version
discourse/discoursegeneric	<2026.1.6 \|\| >=2026.5.0-latest <2026.5.2 \|\| >=2026.6.0-latest <2026.6.1	2026.1.6, 2026.5.2, 2026.6.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for discourse/discourse.
Review the reported fix. Update discourse/discourse to 2026.1.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 17, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, hidden or otherwise unviewable first-post content was leaked as an excerpt in the publicly-served Q&A (QAPage) JSON-LD structured data, exposing it to any unauthenticated visitor and to search-engine crawlers. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Quoted source text, attributed separately from HOL analysis.