Vulnerability · CVE-2026-33410
Discourse is an open-source discussion platform.
Published Mar 19, 2026 · catalog updated Jun 17, 2026 · Discourse is an open-source
Check if you run it
No confirmed exploitation is on record for CVE-2026-33410. EPSS is 0.26%. Act only if a listed version of Discourse is an open-source is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Discourse is an open-source).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium5.4
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.26%
- Remediation
- Advisory link
- Affected products
- cpe discourse/discourse
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have two authorization issues in the chat direct message API. First, when creating a direct message channel or adding users to an existing one, the parameter was passed directly to the user resolution query without checking group or member visibility for the acting user. An authenticated chat user could craft an API request with a known private/hidden group name and receive a channel containing that group's members, leaking their identities. Second, only checked group membership, not the user preference. A chat-disabled user could create or query DM channels between other users via the direct messages API, potentially exposing private content from the serialized channel response. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe discourse/discourse2026.3.0
How to fix CVE-2026-33410
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-33410. EPSS is 0.26%. Act only if a listed version of Discourse is an open-source is installed.
Which versions are affected?
Compare what you have installed with 2026.3.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-863: Incorrect Authorization. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Mar 19, 2026 · NIST NVD
Detected
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have two authorization issues in the chat direct message API. First, when creating a direct message channel or adding users to an existing one, the parameter was passed directly to the user resolution query without checking group or member visibility for the acting user. An authenticated ch
Jun 17, 2026 · NIST NVD
Updated
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have two authorization issues in the chat direct message API. First, when creating a direct message channel or adding users to an existing one, the parameter was passed directly to the user resolution query without checking group or member visibility for the acting user. An authenticated ch
Sources
- CVE.orgVulnerability recordCVE-2026-33410
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-33410
30-day exploitation probability 0.3%
first.org - NIST NVDVulnerability recordCVE-2026-33410
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have two authorization issues in the chat direct message API. First, when creating a direct message channel or adding users to an existing one, the paramet
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.