Discourse prior 3.5.4/2025.11.2/2025.12.1/2026.1.0 Math Plugin cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Discourse. This impacts an unknown function of the component Math Plugin. Performing a manipulation results in cross site scripting. This vulnerability is known as CVE-2025-67723. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Discourse. It has been classified as problematic. This affects some unknown functionality of the component Math Plugin. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have a content-security-policy-mitigated cross-site scriptinv vulnerability on the Discourse Math plugin when using its KaTeX variant. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, the Discourse Math plugin can be disabled, or the Mathjax provider can be used instead of KaTeX.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-67723 since 12/10/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 3.5.4, 2025.11.2, 2025.12.1 or 2026.1.0 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.4
NVD Vector: 🔒

CNA Base Score: 4.6
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Discourse 3.5.4/2025.11.2/2025.12.1/2026.1.0

Timelineinfo

12/10/2025 CVE reserved
01/28/2026 +49 days Advisory disclosed
01/28/2026 +0 days VulDB entry created
02/09/2026 +12 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-955h-m28g-5379
Status: Confirmed

CVE: CVE-2025-67723 (🔒)
GCVE (CVE): GCVE-0-2025-67723
GCVE (VulDB): GCVE-100-343275

Entryinfo

Created: 01/28/2026 20:39
Updated: 02/09/2026 18:57
Changes: 01/28/2026 20:39 (64), 02/09/2026 18:57 (11)
Complete: 🔍
Cache ID: 216::103

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