CVE-2025-23023 - CVE House
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Status published High CVE-2025-23023

Anonymous cache poisoning via request headers in Discourse

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2025-68933
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Discourse users archives leaked to users with moderation privileges
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Affected Vendor

Affected Software

discourse
Vulnerable Versions:
stable: < 3.3.2, tests-passed: < 3.4.0.beta3

Timeline

Official Publish: February 4th, 2025
Last Modified: February 12th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Weaknesses (CWE)

CWE-346

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1190 Exploit Public-Facing Application
Initial Access
T1078 Valid Accounts
Persistence
T1565.002 Stored Data Manipulation
Impact