CVE-2025-61598: Discourse is an open source discussion platform

Q: How do I fix CVE-2025-61598?

discourse: upgrade to 3.5.2, 3.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-61598 being exploited?

CVE-2025-61598 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-61598 affect?

CVE-2025-61598 affects discourse. Severity is medium (CVSS 5.3). 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 respons

Q: How urgent is CVE-2025-61598?

Priority 29/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2025-61598 is a medium-severity flaw (CVSS 5.3) affecting discourse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-524
Published	2025-10-28
Last modified	2026-10-19

Publisher (CNA): GitHub, Inc. · Vendor: discourse

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-28 21:15 UTCPublished CVE record published
2026-10-19 13:10 UTCUpdated Record last modified

discourse discourse UPGRADE

Affected: < 3.5.2 · < 3.6.0 · 3.6.0 beta1

Fixed in: 3.5.2, 3.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy discourse || rpm -q discourse || discourse --version

2. UPGRADE to 3.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade discourse

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade discourse

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-61598?

discourse: upgrade to 3.5.2, 3.6.0. Exact commands for each OS are on this page.

Is CVE-2025-61598 being exploited?

CVE-2025-61598 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-61598 affect?

CVE-2025-61598 affects discourse. Severity is medium (CVSS 5.3). 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 respons

How urgent is CVE-2025-61598?

Priority 29/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-59337 MEDIUM 6.8 UPGRADE Discourse is an open-source community discussion platform
CVE-2025-58055 MEDIUM 4.3 UPGRADE Discourse is an open-source community discussion platform
CVE-2025-58054 LOW 3.5 UPGRADE Discourse is an open-source community discussion platform
CVE-2026-27481 MEDIUM 5.3 UPGRADE Discourse is an open-source discussion platform
CVE-2026-34947 MEDIUM 5.3 UPGRADE Discourse is an open-source discussion platform

References

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