TI-2023-13624 Aliases CVE-2023-29196

HTML injection via topic embedding in Discourse

LOW 27CWE-79Published 2023-04-18 · Updated 2025-02-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

Discourse is an open source platform for community discussion. This vulnerability is not exploitable on the default install of Discourse. A custom feature must be enabled for it to work at all, and the attacker’s payload must pass the CSP to be executed. However, if an attacker succeeds in embedding Javascript that does pass the CSP, it could result in session hijacking for any users that view the attacker’s post. The vulnerability is patched in the latest tests-passed, beta and stable branches. Users are advised to upgrade. Users unable to upgrade should enable and/or restore your site's CSP to the default one provided with Discourse. Remove any embed-able hosts configured.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00313 24th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

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	stable: < 3.0.3; beta: < 3.1.0.beta4	—	No fix listed	CNA

discourse Vendordiscourse Affected stable: < 3.0.3; beta: < 3.1.0.beta4 Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:a:discourse:discourse:::::stable:::*	before 3.0.3	Vulnerable	discourse
cpe:2.3:a:discourse:discourse:::::beta:::*	before 3.1.0	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:3.1.0:beta2:::beta:::*	3.1.0 beta2	Vulnerable	discourse
cpe:2.3:a:discourse:discourse:3.1.0:beta3:::beta:::*	3.1.0 beta3	Vulnerable	discourse

cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:* Versions before 3.0.3 Vulnerable ·discourse
cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:* Versions before 3.1.0 Vulnerable ·discourse
cpe:2.3:a:discourse:discourse:3.1.0:beta1:*:*:beta:*:*:* Versions 3.1.0 beta1 Vulnerable ·discourse
cpe:2.3:a:discourse:discourse:3.1.0:beta2:*:*:beta:*:*:* Versions 3.1.0 beta2 Vulnerable ·discourse
cpe:2.3:a:discourse:discourse:3.1.0:beta3:*:*:beta:*:*:* Versions 3.1.0 beta3 Vulnerable ·discourse

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2023-29196

References

Advisory 1

https://github.com/discourse/discourse/security/advisories/GHSA-986p-4x8q-8f48

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