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PatchSiren cyber security CVE debrief

CVE-2026-32244 discourse CVE debrief

A vulnerability in Discourse, an open-source discussion platform, allows outdated cached AI summaries to leak removed content to anonymous and unprivileged users who cannot regenerate summaries. The issue affects versions prior to 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1. The vulnerability stems from improper handling of cached AI-generated summaries when underlying content has been removed or modified, potentially exposing information to users who should not have access. The CVSS 3.1 score of 5.3 (MEDIUM) reflects network accessibility with low attack complexity, no required privileges, and no user interaction needed, with low confidentiality impact. The weakness classifications include CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), CWE-524 (Use of Cache Containing Sensitive Information), and CWE-672 (Operation on a Resource after Expiration or Release).

Vendor
discourse
Product
Unknown
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-19
Original CVE updated
2026-07-24
Advisory published
2026-05-19
Advisory updated
2026-07-24

Who should care

Organizations running self-hosted Discourse instances with AI summarization features enabled; administrators managing content moderation workflows where posts or topics may be removed; security teams concerned with information disclosure through AI-generated artifacts.

Technical summary

The vulnerability exists in Discourse's AI summarization feature where cached summaries are not properly invalidated or refreshed when the underlying source content is removed. Anonymous and unprivileged users who request summaries may receive cached versions containing content they no longer have permission to view, as they cannot trigger summary regeneration. The fix ensures proper cache invalidation or access control checks against cached summaries.

Defensive priority

medium

Recommended defensive actions

  • Upgrade Discourse to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1 or later
  • If immediate patching is not feasible, restrict summary generation by tightening allowed groups on summarization Personas
  • Review and clear existing AI summary caches to remove potentially stale data containing removed content
  • Audit access logs for AI summary endpoints to identify potential unauthorized access to cached summaries
  • Verify that summarization Persona permissions align with content access controls

Evidence notes

CVE published 2026-05-19T00:16:37.100Z; modified 2026-05-19T14:44:04.023Z. Advisory source: GitHub Security Advisory GHSA-hjmg-2mww-vfvx.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-32244 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-32244

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-32244 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-32244

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.