TI-2023-10629 Aliases CVE-2023-25167

Regular expression denial of service via installing themes via git in discourse

LOW 30CWE-1333Published 2023-02-08 · Updated 2025-03-10

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-1333.

Summary

Discourse is an open source discussion platform. In affected versions a malicious user can cause a regular expression denial of service using a carefully crafted git URL. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. Users are advised to upgrade. There are no known workarounds for this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00567 47th percentileScored 2026-11-07

Fix Fixed discourse (discourse): 3.0.1, 3.1.0.beta2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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 3.0.1; 3.1.0.beta to before 3.1.0.beta2	3.0.1, 3.1.0.beta2	Patch available	CNA

discourse Vendordiscourse Affected before 3.0.1; 3.1.0.beta to before 3.1.0.beta2 Fixed in 3.0.1, 3.1.0.beta2 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:discourse:discourse::::::::	before 3.0.1	Vulnerable	discourse
cpe:2.3:a:discourse:discourse:3.1.0:beta1:::beta:::*	3.1.0 beta1	Vulnerable	discourse

cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* Versions before 3.0.1 Vulnerable ·discourse
cpe:2.3:a:discourse:discourse:3.1.0:beta1:*:*:beta:*:*:* Versions 3.1.0 beta1 Vulnerable ·discourse

Remediation

Fix · CNA discourse (discourse) Fixed in 3.0.1, 3.1.0.beta2

Timeline

2026-10-02 Threatist record created from CVE-2023-25167

References

Patch 1

https://github.com/discourse/discourse/commit/ec4c30270887366dc28788bc4ab8a22a098573cd

Advisory 1

https://github.com/discourse/discourse/security/advisories/GHSA-4w55-w26q-r35w

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