CVE-2026-4120 json
Info Cards <= 2.0.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes
published 2026-03-19 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-13072
- 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 14%
- public exploits
- 0
- none known
Summary
The Info Cards – Add Text and Media in Card Layouts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'btnUrl' parameter within the Info Cards block in all versions up to, and including, 2.0.7. This is due to insufficient input validation on URL schemes, specifically the lack of javascript: protocol filtering. The block's render.php passes all attributes as JSON to the frontend via a data-attributes HTML attribute using esc_attr(wp_json_encode()), which prevents HTML attribute injection but does not validate URL protocols within the JSON data. The client-side view.js then renders the btnUrl value directly as an href attribute on anchor elements without any protocol sanitization. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject javascript: URLs that execute arbitrary web scripts when a user clicks the rendered button link.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 14% 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
- bplugins Info Cards – Add Text and Media in Card Layouts
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/279984d9-f352-467f-a53d-814466d70326?source=cve
- plugins.trac.wordpress.org /browser/info-cards/trunk/build/render.php#L8
- plugins.trac.wordpress.org /browser/info-cards/tags/2.0.7/build/render.php#L8
- plugins.trac.wordpress.org /browser/info-cards/trunk/build/view.js#L2
- plugins.trac.wordpress.org /browser/info-cards/tags/2.0.7/build/view.js#L2
- plugins.trac.wordpress.org /browser/info-cards/trunk/build/block.json#L35
- plugins.trac.wordpress.org /browser/info-cards/tags/2.0.7/build/block.json#L35
- plugins.trac.wordpress.org /browser/info-cards/trunk/build/render.php?rev=3482902
Sources
- CVE List CVE-2026-4120
- NVD CVE-2026-4120
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.