CVE-2026-33424

Name: CVE-2026-33424
Creator: NVD / NIST
Published: 2026-03-21T00:16:26.853+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2026-33424 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, an attacker can grant access to a private message topic through invites even after they lose access to that PM. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, an attacker can grant access to a private message topic through invites even after they lose access to that PM. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.22%

12.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Discourse	Discourse	>= 2026.1.0, < 2026.1.2
Discourse	Discourse	>= 2026.2.0, < 2026.2.1
Discourse	Discourse	2026.3.0

References

https://github.com/discourse/discourse/security/advisories/GHSA-hgcp-p7hq-cwxwVendor Advisory

Timeline

Published: Mar 21, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33424?

How severe is CVE-2026-33424?

CVE-2026-33424 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33424?

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-2026-33424?

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

Scan your code now

Source: NVD / NIST