CVE-2026-32619: Discourse: Insufficient topic visibility check allows unauthorized poll manipulation in private categories

Severity: medium (CVSS 4.3 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: 2026-03-31 · updated 2026-07-24
Weakness: CWE-285

Description

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, users who lost access to a topic (e.g., removed from a private category group) could still interact with polls in that topic, including voting and toggling poll status. No content was exposed, but users could modify poll state in topics they should no longer have access to. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Affected products

discourse: from 2026.1.0 before 2026.1.3; from 2026.2.0 before 2026.2.2; 2026.3.0 — fixed in 2026.1.3, 2026.2.2

How to fix

Upgrade to a fixed version: discourse 2026.1.3, 2026.2.2. Check the vendor advisory for mitigations.

References

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