What is the CVSS score of CVE-2026-28219?

CVE-2026-28219 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.1%.

Which versions of Discourse are affected by CVE-2026-28219?

Organizations using Discourse should be aware of moderate risk from CVE-2026-28219 rated CVSS 4.3. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-28219?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Discourse CVE-2026-28219

MEDIUM

Improperly Controlled Modification of Dynamically-Determined Object Attributes (CWE-915)

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

Code Injection Discourse

4.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.3 MEDIUM

AV:N/AC:L/PR:L/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

Low

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

MEDIUM 4.3

DescriptionGitHub Advisory

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an improper authorization check in the topic management logic allows authenticated users to modify privileged attributes of their topics. By manipulating specific parameters in a PUT or POST request, a regular user can elevate a topic’s status to a site-wide notice or banner, bypassing intended administrative restrictions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. There are no practical workarounds to prevent this behavior other than applying the security patch. Administrators concerned about unauthorized promotions should audit recent changes to site banners and global notices until the fix is deployed.

AnalysisAI

Discourse versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 contain an authorization bypass that allows authenticated users to escalate ordinary topics to site-wide notices or banners by manipulating request parameters, circumventing administrative controls. This vulnerability affects any Discourse instance where regular users should not have the ability to create global announcements. No patch is currently available, and administrators should review recent banner and notice changes for unauthorized modifications until updating.

Technical ContextAI

This vulnerability (CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes) affects Discourse. Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an improper authorization check in the topic management logic allows authenticated users to modify privileged attributes of their topics. By manipulating specific parameters in a PUT or POST request, a regular user can elevate a topic’s status to a site-wide notice or banner, bypassing intended administrative restrictions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. There are no