Information Leakage in Discourse Discussion Platform
CVE-2026-49256

6.3MEDIUM

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
9 July 2026

What is CVE-2026-49256?

The Discourse discussion platform has a vulnerability that allows sensitive tag and tag-group names, linked to publicly readable categories, to be exposed to unauthorized and anonymous users via category and group endpoints. This issue affects versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, and has been resolved in these later updates.

Affected Version(s)

discourse >= 2026.1.0-latest, < 2026.1.5 < 2026.1.0-latest, 2026.1.5

discourse >= 2026.4.0-latest, < 2026.4.2 < 2026.4.0-latest, 2026.4.2

discourse >= 2026.5.0-latest, < 2026.5.1 < 2026.5.0-latest, 2026.5.1

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM
https://github.com/discourse/discourse/releases/tag/v2026...
x_refsource_MISC
https://github.com/discourse/discourse/releases/tag/v2026...
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.