Medium severity · published Oct 2, 2026
CVE-2026-104466
YesWiki before 4.6.7 Stored XSS via Wakka Markdown Image src Attribute
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
YE
yeswiki · YesWiki
before 4.6.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104466
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104466
vendor-advisory
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-7pv9-pwm8-cwwr
third-party-advisory
https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-stored-xss-via-wakka-markdown-image-src-attribute
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