CVE-2023-30611: Reaction metadata exposed in private topics in Discourse-reactions

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-04-19 · updated 2026-06-17
Weakness: CWE-200

Description

Discourse-reactions is a plugin that allows user to add their reactions to the post in the Discourse messaging platform. In affected versions data about what reactions were performed on a post in a private topic could be leaked. This issue has been addressed in version 0.3. Users are advised to upgrade. Users unable to upgrade should disable the discourse-reactions plugin to fully mitigate the issue.

Affected products

discourse Reactions: 0.2

References

https://github.com/discourse/discourse-reactions/commit/01aca15b2774c088f3673118e92e9469f37d2fb6
https://github.com/discourse/discourse-reactions/security/advisories/GHSA-4cgc-c7vh-94g6
https://github.com/discourse/discourse-reactions/commit/01aca15b2774c088f3673118e92e9469f37d2fb6
https://github.com/discourse/discourse-reactions/security/advisories/GHSA-4cgc-c7vh-94g6

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