CVE-2026-120500

MEDIUM 6.1

An Otter Wiki before 2.26.2 Stored XSS via Math Code Block

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	redimp
Product	otterwiki
Published	Nov 2, 2026
Last Updated	Nov 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

redimp / otterwiki

2.0.0 < 2.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/redimp/otterwiki/commit/b2e91d20ed36c01ce140d18698f9abb90685d481 github.com: https://github.com/redimp/otterwiki/releases/tag/v2.26.2 vulncheck.com: https://www.vulncheck.com/advisories/an-otter-wiki-before-2.26.2-stored-xss-via-math-code-block

Credits

Zachariah Mithani (AploSec) Ralph Thesen