What is the CVSS score of CVE-2026-27153?

CVE-2026-27153 has a CVSS 3.1 base score of 2.7 (Low). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Discourse are affected by CVE-2026-27153?

CVE-2026-27153 is a low-severity vulnerability in Discourse (CVSS 2.7). The limited severity suggests constrained impact, typically requiring specific conditions or local access for exploitation.

How to fix or mitigate CVE-2026-27153?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Discourse CVE-2026-27153

LOW

Incorrect Authorization (CWE-863)

2026-02-26 security-advisories@github.com

Authentication Bypass Discourse

2.7

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

2.7 LOW

AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:56 vuln.today

CVE Published

Feb 26, 2026 - 22:20 nvd

LOW 2.7

DescriptionGitHub Advisory

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.

AnalysisAI

Technical ContextAI

Classified as CWE-863 (Incorrect Authorization). Affects the CSV export component of Discourse. 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.