Vulnerability · Published Nov 2, 2026 · Assigned by VulnCheck

CVE-2026-120500An Otter Wiki before 2.26.2 Stored XSS via Math Code Block

Medium 6.1

In plain English

A medium-severity cross-site scripting in otterwiki from redimp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 78.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
redimp	otterwiki	2.0.0 – before 2.26.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/redimp/otterwiki/commit/b2e91d20ed36c01ce140d18698f9abb90685d481 patch
otterwiki v2.26.2 Release Notes release-notes
VulnCheck Advisory: An Otter Wiki before 2.26.2 Stored XSS via Math Code Block third-party-advisory