Answer in brief
CVE-2026-109983 records a Medium severity (CVSS 6.4) vulnerability in YMC Filter <= 3.12.19 - Authenticated (Author+) Stored DOM-Based Cross-Site Scripting via 'post_title' Parameter. The current sources do not mark it as known exploited. The current feed maps wssoffice21/YMC Filter (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps wssoffice21/YMC Filter (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| wssoffice21/YMC Filtergeneric | >=0 <=3.12.19 | Not reported |
Published upstream
Oct 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 17, 2026
The 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.
Quoted source text, attributed separately from HOL analysis.