What is CVE-2025-61598?

CVE-2025-61598 is a medium-severity vulnerability in Discourse, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.3/10. Published 2025-10-28.

How severe is CVE-2025-61598?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Discourse

CVE-2025-61598

Discourse is an open source discussion platform. Version before 3.6.2 and 3.6.0.beta2, default Cache-Control response header with value no-store, no-cache was missing from error responses. This may caused unintended caching of those responses by proxies potentially leading to cache poisoning attacks. This vulnerability is fixed in 3.6.2 and 3.6.0.beta2.

Published 2025-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.7th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Discourse — versions 3.6.0, >= 3.6.0.beta1, < 3.6.0.beta2, < 3.6.2

Weakness classification (CWE)

CWE-524 — Use of Cache Containing Sensitive Information

References

github.com/discourse/discourse/security/advisories/GHSA-jp9x-wwv6-cv3j (Third Party Advisory)
github.com/discourse/discourse/commit/3ea1b663c82c067e5ca778db846bad1e082ba6cd (Patch)
github.com/discourse/discourse/commit/fd567af7bf5a15c70772021acbdf5d38487a31bc (Patch)

Frequently asked questions

What is CVE-2025-61598?: CVE-2025-61598 is a medium-severity vulnerability in Discourse, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.3/10. Published 2025-10-28.
How severe is CVE-2025-61598?: Medium severity. CVSS v3 base score is 5.3 out of 10.