Cross-site scripting in mermaid - CVE-2025-54881

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Main Vulnerability Database Vulnerabilities #VU116012

Cross-site scripting in mermaid - CVE-2025-54881

Published: September 23, 2025


Vulnerability identifier: #VU116012
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2025-54881
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data passed via diagram labels. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


Affected software

mermaid
Fedora
jupyterlab
forgejo
nextcloud

How to mitigate CVE-2025-54881

Install updates from vendor's website.

mermaid - addressed in versions 10.9.4, 11.10.0
jupyterlab - addressed in versions 4.4.7-1.el10_1, 4.4.7-1.el10_2, 4.4.7-1.fc41, 4.4.7-1.fc42, 4.4.7-1.fc43
forgejo - addressed in versions 12.0.3-1.el10_2, 12.0.3-1.fc42
nextcloud - addressed in versions 31.0.9-1.el10_1, 31.0.9-1.el10_2, 31.0.9-1.fc41, 31.0.9-1.fc42, 31.0.9-1.fc43, 31.0.9-1.fc44

External References

Related Security Bulletins