Medium severity · published Oct 1, 2026
CVE-2026-103339
WordPress Metform plugin <= 4.3.0 - Cross Site Scripting (XSS) vulnerability
6.5
CVSS
0.1%
EPSS
No
On KEV
Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Wpmet Metform metform allows Stored XSS.This issue affects Metform: from n/a through 4.3.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Metform · Wpmet
through 4.3.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103339
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103339
vdb-entry
https://patchstack.com/database/wordpress/plugin/metform/vulnerability/wordpress-metform-plugin-4-3-0-cross-site-scripting-xss-vulnerability?_s_id=cve
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