TI-2022-13222 Aliases CVE-2022-31182

Cache poisoning via maliciously-formed request in Discourse

LOW 31CWE-404Published 2022-08-01 · Updated 2025-04-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-404.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00799 56th percentileScored 2026-11-07

Fix Fixed discourse (discourse): 2.8.7, 2.9.0.beta8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
discourse	discourse	before 2.8.7; before 2.9.0.beta8	2.8.7, 2.9.0.beta8	Patch available	CNA

discourse Vendordiscourse Affected before 2.8.7; before 2.9.0.beta8 Fixed in 2.8.7, 2.9.0.beta8 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:discourse:discourse::::::::	before 2.8.7	Vulnerable	discourse
cpe:2.3:a:discourse:discourse:2.9.0:beta7::::::	2.9.0 beta7	Vulnerable	discourse

cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* Versions before 2.8.7 Vulnerable ·discourse
cpe:2.3:a:discourse:discourse:2.9.0:beta7:*:*:*:*:*:* Versions 2.9.0 beta7 Vulnerable ·discourse

Remediation

Fix · CNA discourse (discourse) Fixed in 2.8.7, 2.9.0.beta8

Timeline

2026-10-02 Threatist record created from CVE-2022-31182

References

Patch 1

https://github.com/discourse/discourse/commit/7af25544c3940c4d046c51f4cfac9c72a06d4f50

Advisory 1

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

TI-2021-19656 Denial of Service in discourse CVSS 3.1MEDIUM 6.8
TI-2024-36150 Potential Backup file leaked via Nginx in Discourse CVSS 3.1HIGH 7.5
TI-2021-18002 RCE via malicious SNS subscription payload CVSS 3.1CRITICAL 10.0
TI-2026-24651 Discourse: Open redirect via `sso_destination_url` cookie in `enter` CVSS 4.0MEDIUM 5.1
TI-2026-22278 Discourse leaks private topic title and post excerpt via user action API endpoint CVSS 4.0HIGH 8.7
TI-2023-24152 Unauthenticated access to new private chat messages in Discourse CVSS 3.1HIGH 7.5

See all 262 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences