CVE-2022-24824: Anonymous user cache poisoning in discourse

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-14 · updated 2026-06-17
Weakness: CWE-829

Description

Discourse is an open source platform for community discussion. In affected versions an attacker can poison the cache for anonymous (i.e. not logged in) users, such that the users are shown the crawler view of the site instead of the HTML page. This can lead to a partial denial-of-service. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. There are no known workarounds for this issue.

Affected products

discourse: before 2.8.3; 2.9.0-beta1, 2.9.0-beta2, 2.9.0-beta3 — fixed in 2.8.3

How to fix

Upgrade to a fixed version: discourse 2.8.3. Check the vendor advisory for mitigations.

References

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