PT-2026-26716 · Discourse · Discourse

Davidtaylorhq · Published 2026-03-20 · Updated 2026-03-27 · CVE-2026-33428

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.3.0-latest.1 Discourse versions prior to 2026.2.1 Discourse versions prior to 2026.1.2

Description Discourse is an open-source discussion platform. A non-staff user with elevated group membership could access deleted posts belonging to any user. This was due to an overly broad authorization check on the deleted posts index endpoint /deleted-posts.

Recommendations Update to Discourse version 2026.3.0-latest.1 or later. Update to Discourse version 2026.2.1 or later. Update to Discourse version 2026.1.2 or later.

Exploit

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

BIT-DISCOURSE-2026-33428

CVE-2026-33428

GHSA-FRCW-P4MC-X6MP

Affected Products

Discourse

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33428.json · Exploit
• https://github.com/discourse/discourse/security/advisories/GHSA-frcw-p4mc-x6mp · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33428 · Security Note
• https://osv.dev/vulnerability/BIT-discourse-2026-33428 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33428 · Vendor Advisory
• https://twitter.com/CVEnew/status/2035262105130041649 · Twitter Post