PT-2026-26424 · Discourse · Discourse

Davidtaylorhq · Published 2026-03-19 · Updated 2026-03-27 · CVE-2026-33355

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. The /private-posts API endpoint did not apply post-type visibility filtering in versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2. This allowed regular participants in private message (PM) topics to view whisper posts within those topics, even if they were not intended to have access. The post-type is a parameter that determines the visibility of a post.

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

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

BIT-DISCOURSE-2026-33355

CVE-2026-33355

GHSA-G4V5-6GFP-3HJQ

Affected Products

Discourse

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33355.json · Exploit
• https://github.com/discourse/discourse/security/advisories/GHSA-g4v5-6gfp-3hjq · Vendor Advisory
• https://github.com/discourse/discourse/commit/84e5865a279716c6866e8c0648d1d8b42320603c · Patch
• https://github.com/discourse/discourse/commit/d2f317271ad7638f1e2791905472ebd9370946d1 · Patch
• https://github.com/discourse/discourse/commit/d25b8ee9ee182dbb34e92b34e39878ce4d59bcdc · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-33355 · Security Note
• https://osv.dev/vulnerability/BIT-discourse-2026-33355 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33355 · Vendor Advisory
• https://twitter.com/CVEnew/status/2034891617031655611 · Twitter Post