YMC Filter <= 3.12.19 - Authenticated (Author+) Stored DOM-Based Cross-Site Scripting via 'post_title' Parameter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-109983
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-17 08:16:28 UTC
Updated2026-10-17 08:16:28 UTC
DescriptionThe YMC Filter plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'post_title' parameter in all versions up to, and including, 3.12.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The autocomplete REST endpoint is registered with a permission callback that unconditionally returns true, meaning any site visitor — including unauthenticated users — can trigger the payload simply by typing in the YMC filter search box, while only Author-level access is required to store it.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

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

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wssoffice21 YMC Filter affected 3.12.19 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/src/api/controller... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/src/api/abstracts/... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/27cfa62d-ba16-4344-be0c-82cac... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/assets/js/frontend... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/src/api/controller... [email protected] plugins.trac.wordpress.org
wordpress.org/plugins/ymc-smart-filter [email protected] wordpress.org
plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.20/ymc2/src/api/controller... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Wordfence PRISM (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-14T12:21:09.000ZVendor Notified
CNA2026-10-16T19:36:49.000ZDisclosed

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