GHSA-fmqh-3qcq-wcxg · Severity: medium — The Ultimate Post plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ...
The Ultimate Post plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'moreResultsText' block attribute of the ultimate-post/advanced-search block in versions up to and including 5.0.31. This is due to insufficient input sanitization and output escaping in the Advanced_Search::content() render callback: the attribute value is filtered with wp_kses(), which strips disallowed HTML tags but does NOT escape HTML special characters such as double quotes in plain text, and the result is then concatenated directly into the data-viewmoretext HTML attribute without esc_attr(). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Conclusion & alert: CVE-2026-13253 is rated Low Risk (29.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.21%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-07-09 | — | 0.21% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.4 | 3.1 | MEDIUM |
|
3.1 | 2.7 | [email protected] |
GHSA-fmqh-3qcq-wcxg · Severity: medium — The Ultimate Post plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ...
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||