---
id: CVE-2026-104466
title: >-
  YesWiki before 4.6.7 contains a stored cross-site scripting vulnerability in
  formatters/wakka.php that allows users who can edit pages or post comments to
  inject event handlers by placing quotes in markdown image URLs
summary: >-
  YesWiki before 4.6.7 contains a stored cross-site scripting vulnerability in
  formatters/wakka.php that allows users who can edit pages or post comments to
  inject event handlers by placing quotes in markdown image URLs. Attackers can
  stor…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: YesWiki
product: yeswiki
affected:
  - yeswiki < 4.6.7
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T12:17:19.333'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104466'
references:
  - url: 'https://github.com/YesWiki/yeswiki/security/advisories/GHSA-7pv9-pwm8-cwwr'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-stored-xss-via-wakka-markdown-image-src-attribute
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T12:17:44.345Z'
---

## Overview

YesWiki before 4.6.7 contains a stored cross-site scripting vulnerability in formatters/wakka.php that allows users who can edit pages or post comments to inject event handlers by placing quotes in markdown image URLs. Attackers can store a crafted markdown image whose src breaks out of the attribute to add an onerror handler, executing JavaScript in viewers' browsers, including administrators.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.