PT-2026-56997 · Discourse · Discourse

Published 2026-07-09 · Updated 2026-07-09 · CVE-2026-49256

NVD

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowed tags, allowed tag groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

CVE-2026-49256

Affected Products

Discourse

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-49256 · Security Note
• https://github.com/discourse/discourse/releases/tag/v2026.6.0 · Note
• https://github.com/discourse/discourse/releases/tag/v2026.4.2 · Note
• https://github.com/discourse/discourse/releases/tag/v2026.5.1 · Note
• https://github.com/discourse/discourse/releases/tag/v2026.1.5 · Note
• https://github.com/discourse/discourse/security/advisories/GHSA-mwp7-572g-6qpx · Note