CVE-2026-27153 | THREATINT

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.

PUBLISHED Reserved 2026-02-18 | Published 2026-02-26 | Updated 2026-02-26 | Assigner GitHub_M

LOW: 1.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

Problem types

CWE-863: Incorrect Authorization

Product status

< 2025.12.2

affected

>= 2026.1.0-latest, < 2026.1.1

affected

>= 2026.2.0-latest, < 2026.2.0

affected

References

github.com/...course/security/advisories/GHSA-5cp2-jq8m-33mf

cve.org (CVE-2026-27153)

nvd.nist.gov (CVE-2026-27153)

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