CVE-2026-120500
Received Received - Intake

Stored XSS in Otter Wiki via Math Code Block

Publication date: 2026-11-02

Last updated on: 2026-11-02

Assigner: VulnCheck

Description
An Otter Wiki before 2.26.2 contains a stored cross-site scripting vulnerability in OtterwikiMdRenderer.block_code that allows attackers who can edit pages, including anonymous users under the default configuration, to inject arbitrary script. Attackers can place HTML inside a math fenced code block, which is rendered unescaped and executes for every viewer of the page.

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Meta Information

Published
2026-11-02
Last Modified
2026-11-02
Generated
2026-11-02
AI Q&A
2026-11-02
EPSS Evaluated
N/A
NVD
CVE-2026-120500

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
redimp otterwiki 2.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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.

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Executive Summary

This vulnerability is a stored cross-site scripting (XSS) flaw in Otter Wiki versions before 2.26.2. It exists in the OtterwikiMdRenderer.block_code function, allowing attackers who can edit pages to inject malicious scripts. The attack works by placing HTML inside a math fenced code block, which is then rendered unescaped and executes for every viewer of the page.

Detection Guidance

To detect this vulnerability, inspect Otter Wiki pages for malicious scripts in math fenced code blocks. Check for HTML tags or scripts in rendered content. Review page edit history for unauthorized changes.

Impact Analysis

If you use Otter Wiki before version 2.26.2, attackers could steal session cookies, perform actions on your behalf, or redirect you to malicious sites. Even anonymous users might exploit this under default settings. The impact includes unauthorized access to user accounts and potential data breaches.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection. Organizations using affected Otter Wiki versions may face compliance violations, potential fines, and reputational damage due to insufficient protection against XSS attacks.

Mitigation Strategies

Upgrade Otter Wiki to version 2.26.2 or later. Restrict page editing permissions to trusted users. Sanitize user input to prevent HTML/script injection. Monitor for suspicious page edits or unusual activity.

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