What’s Vulnerable › Vulnerabilities

CVE-2022-31182: Cache poisoning via maliciously-formed request in Discourse

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-08-01 · updated 2026-06-17
• Weakness: CWE-404

Description

Discourse is the an open source discussion platform. In affected versions a maliciously crafted request for static assets could cause error responses to be cached by Discourse's default NGINX proxy configuration. A corrected NGINX configuration is included in the latest stable, beta and tests-passed versions of Discourse. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• discourse: before 2.8.7; 2.9.0-beta7 — fixed in 2.8.7

How to fix

Upgrade to a fixed version: discourse 2.8.7. Check the vendor advisory for mitigations.

References

• https://github.com/discourse/discourse/commit/7af25544c3940c4d046c51f4cfac9c72a06d4f50
• https://github.com/discourse/discourse/security/advisories/GHSA-4ff8-3j78-w6pp
• https://github.com/discourse/discourse/commit/7af25544c3940c4d046c51f4cfac9c72a06d4f50
• https://github.com/discourse/discourse/security/advisories/GHSA-4ff8-3j78-w6pp

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