PT-2026-26541 · Discourse · Discourse

Jomaxro · CVE-2026-30891 · Published 2026-03-20 · Updated 2026-03-27

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. Insufficient authorization checks in the user actions API endpoint allowed a user to access another user's private activity. The user actions endpoint is vulnerable, potentially exposing private user data. The vulnerable parameter is not specified.

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

Exploit

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

BIT-DISCOURSE-2026-30891

CVE-2026-30891

GHSA-WW5F-24G5-C33G

Affected Products

Discourse

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30891.json · Exploit
• https://github.com/discourse/discourse/security/advisories/GHSA-ww5f-24g5-c33g · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-30891 · Security Note
• https://osv.dev/vulnerability/CVE-2026-30891 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-discourse-2026-30891 · Vendor Advisory
• https://twitter.com/CVEnew/status/2034841426916479238 · Twitter Post