CVE-2026-28282

Summary

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.

Affected Software

Weaknesses

• CWE-863: CWE-863: Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/discourse/discourse/security/advisories/GHSA-6cc8-x3rm-j5pf
• https://github.com/discourse/discourse/commit/64e2514ac17046cfaa8bc68a3c5140bc40736add
• https://github.com/discourse/discourse/commit/c14b8a4cc5fc94e4839a83c5d55765897589f45b
• https://github.com/discourse/discourse/commit/dcde9de530f515e88f99957056ffbcc2e1e03951

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