CVE-2025-23023 json
Anonymous cache poisoning via request headers in Discourse
published last yr. modified 2mo ago also BIT-discourse-2025-23023 , EUVD-2025-3079 , GHSA-5h4h-2f46-r3c7
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami discourse 3.3.2
- discourse discourse 3.3.2, 3.4.0.beta3
Is CVE-2025-23023 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L |
| OSV | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <3.3.2 |
3.3.2 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-346 Origin Validation Error
References
-
github.com
/discourse/discourse/security/advisories/GHSA-5h4h-2f46-r3c7
third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-23023
web
Sources
- CVE List CVE-2025-23023
- NVD CVE-2025-23023
- OSV BIT-discourse-2025-23023
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.