PT-2026-26709 · Discourse · Discourse

Davidtaylorhq · Published 2026-03-20 · Updated 2026-03-27 · CVE-2026-33425

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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. Unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the exclude groups parameter. This is possible through observing directory results.

Recommendations Update to version 2026.3.0-latest.1 or later. Update to version 2026.2.1 or later. Update to version 2026.1.2 or later. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.

Exploit

Fix

Missing Authorization

Side Channel Attack

IDOR

Weakness Enumeration

CWE-862

CWE-203

CWE-639

Related Identifiers

BIT-DISCOURSE-2026-33425

CVE-2026-33425

GHSA-R6RH-XVF5-R5F2

Affected Products

Discourse

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33425.json · Exploit
• https://github.com/discourse/discourse/security/advisories/GHSA-r6rh-xvf5-r5f2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33425 · Security Note
• https://osv.dev/vulnerability/BIT-discourse-2026-33425 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33425 · Vendor Advisory
• https://twitter.com/CVEnew/status/2035262110435885488 · Twitter Post