Vulnerability · Published Feb 4, 2025 · Assigned by GitHub_M

CVE-2025-23023Anonymous cache poisoning via request headers in Discourse

High 8.2

In plain English

A high-severity security flaw in discourse from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.3%top 82.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Discourse is an open source platform for community discussion. In affected versions an attacker can carefully craft a request with the right request headers to poison the anonymous cache (for example, the cache may have a response with missing preloaded data). This issue only affects anonymous visitors of the site. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade may disable anonymous cache by setting the `DISCOURSE_DISABLE_ANON_CACHE` environment variable to a non-empty value.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	stable: < 3.3.2tests-passed: < 3.4.0.beta3

Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

References

https://github.com/discourse/discourse/security/advisories/GHSA-5h4h-2f46-r3c7 x_refsource_CONFIRM