PT-2026-26542 · Discourse · Discourse

Published 2026-03-20 · Updated 2026-03-20 · CVE-2026-31805

Mitre

CVSS v3.1

5.3

Medium

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, an authorization bypass in the poll plugin allowed authenticated users to vote on, remove votes from, or toggle the open/closed status of polls they did not have access to. By passing post id as an array (e.g. post id[]=&post id[]=), the authorization check resolves to the accessible post while the poll lookup resolves to a different post's poll. This affects the vote, remove vote, and toggle status endpoints in DiscoursePoll::PollsController. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch.

Fix

RCE

Incorrect Authorization

Weakness Enumeration

CWE-20

CWE-863

Related Identifiers

CVE-2026-31805

Affected Products

Discourse

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-31805 · Security Note
• https://github.com/discourse/discourse/security/advisories/GHSA-fgxm-prjv-g823 · Note
• https://github.com/discourse/discourse/commit/1a6b3cdd8939053f485a60a6ea004a40878392c4 · Note