CVE-2026-28227

Name: CVE-2026-28227
Creator: NVD / NIST
Published: 2026-02-26T22:20:49.927+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 1.2/10EPSS 3.12%

Last modified Jun 17, 2026

CVE-2026-28227 is a low-severity vulnerability rated 1.2/10 on the CVSS scale. Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. EPSS estimates a 3.12% chance of exploitation in the next 30 days.

Description

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

Metrics

CVSS 3.1

2.7/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

CVSS 4.0

1.2/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

3.12%

86.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Discourse	Discourse	< 2025.12.2
Discourse	Discourse	>= 2026.1.0, < 2026.1.1
Discourse	Discourse	2026.2.0

References

https://github.com/discourse/discourse/security/advisories/GHSA-m49w-78mh-87jpVendor Advisory

Timeline

Published: Feb 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-28227?

How severe is CVE-2026-28227?

CVE-2026-28227 has a CVSS score of 1.2/10 (LOW severity). The EPSS model estimates a 3.12% probability of exploitation in the next 30 days.

How do I fix CVE-2026-28227?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28227?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST