CVE-2026-27153

LOW

Discourse <2025.12.2/2026.1.1/2026.2.0 - Info Disclosure

Title source: llm
STIX 2.1

Description

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, moderators could export user Chat DMs via the CSV export endpoint by exploiting an overly permissive allowlist in `can_export_entity?`. The method allowed moderators to export any entity not explicitly blocked instead of restricting to an explicit allowlist. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

References (1)

Core 1
Core References

Scores

CVSS v3 2.7
EPSS 0.0005
EPSS Percentile 15.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-863
Status published
Products (2)
discourse/discourse 2026.2.0
discourse/discourse < 2025.12.2
Published Feb 26, 2026
Tracked Since Feb 27, 2026