CVE-2026-28282Discourse vulnerable to group membership addition permission bypass via discourse-policy plugin
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a security flaw in the discourse-policy plugin which allowed a user with policy creation permission to gain membership access to any private/restricted groups. Once membership to a private/restricted group has been obtained, the user will be able to read private topics that only the group has access to. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, review all policies for the use of `add-users-to-group` and temporarily remove the attribute from the policy. Alternatively, disable the discourse-policy plugin by disabling the `policy_enabled` site setting.
- CVSS
- 2.3 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Mar 20, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
discourse discourse discourse:discourse (from the name) | from 2026.1.0-latest, < 2026.1.2; from 2026.2.0-latest, < 2026.2.1; = 2026.3.0-latest | CNA record |
discourse discourse discourse:discourse | from 2026.1.0 before 2026.1.2; from 2026.2.0 before 2026.2.1; 2026.3.0 | NVD |
References
- https://github.com/discourse/discourse/security/advisories/GHSA-6cc8-x3rm-j5pfx-refsource-confirm, vendor-advisory
- https://github.com/discourse/discourse/commit/64e2514ac17046cfaa8bc68a3c5140bc40736addx-refsource-misc, patch
- https://github.com/discourse/discourse/commit/c14b8a4cc5fc94e4839a83c5d55765897589f45bx-refsource-misc, patch
- https://github.com/discourse/discourse/commit/dcde9de530f515e88f99957056ffbcc2e1e03951x-refsource-misc, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.