CVE-2026-32244: Discourse: Cached outdated summaries can leak removed content

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-19 · updated 2026-07-24
Weakness: CWE-200

Description

Discourse is an open-source discussion platform. In versions prior to 2026.1.4, 2026.3.1, 2026.4.1 and 2026.5.0-latest.1, outdated cached AI summaries can leak removed content to anonymous and unprivileged users who cannot regenerate summaries. This issue has been fixed in versions 2026.1.4, 2026.3.1, 2026.4.1 and 2026.5.0-latest.1. To work around this issue, restrict summary generation by tightening the allowed groups on the summarization Personas.

Affected products

discourse: from 2026.1.0 before 2026.1.4; from 2026.3.0 before 2026.3.1; from 2026.4.0 before 2026.4.1; 2026.5.0 — fixed in 2026.1.4, 2026.3.1, 2026.4.1

How to fix

Upgrade to a fixed version: discourse 2026.1.4, 2026.3.1, 2026.4.1. Check the vendor advisory for mitigations.

References

https://github.com/discourse/discourse/security/advisories/GHSA-hjmg-2mww-vfvx

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