CVE-2026-4067 json
Ad Short <= 2.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'client' Shortcode Attribute
published 2026-03-21 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-13999
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
The Ad Short plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ad' shortcode's 'client' attribute in all versions up to and including 2.0.1. This is due to insufficient input sanitization and output escaping on the 'client' shortcode attribute. The ad_func() shortcode handler at line 71 accepts a 'client' attribute via shortcode_atts() and directly concatenates it into a double-quoted HTML attribute (data-ad-client) at line 130 without applying esc_attr() or any other sanitization. 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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- nocaredev Ad Short
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/313d2749-7662-4870-b0f7-19253797f833?source=cve
- plugins.trac.wordpress.org /browser/ad-short/trunk/ad_short.php#L130
- plugins.trac.wordpress.org /browser/ad-short/tags/2.0.1/ad_short.php#L130
- plugins.trac.wordpress.org /browser/ad-short/trunk/ad_short.php#L77
- plugins.trac.wordpress.org /browser/ad-short/tags/2.0.1/ad_short.php#L77
Sources
- CVE List CVE-2026-4067
- NVD CVE-2026-4067
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.