CVE-2026-125409 json
Passster <= 4.3.21 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'metavalue' Parameter
published 2d ago modified 2d ago also EUVD-2026-124982
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
The Passster – Password Protect Pages and Content plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'metavalue (metakeyinput=passster_id | passster_headline)' parameter in all versions up to, and including, 4.3.21 due to insufficient input sanitization and output escaping. 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. A Contributor can break out of the shortcode attribute context by embedding a ] character in the passster_id or passster_headline meta value to prematurely close the opening shortcode tag, then append a [/passster] closing tag so that the trailing HTML payload is emitted verbatim by do_shortcode() — bypassing the per-attribute escaping present inside render_shortcode() — and the script will also execute in an editor's or administrator's browser when they preview the Contributor's pending post, since filter_the_content() has no edit-permission capability gate.
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Check with FencerExploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-14).
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 |
| NVD | 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
- wpchill Passster – Password Protect Pages and Content
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/81cf06d2-9b5a-4f9f-adf9-890b46db7783?source=cve
- plugins.trac.wordpress.org /browser/content-protector/tags/4.3.21/inc/class-ps-public.php#L417
- plugins.trac.wordpress.org /browser/content-protector/tags/4.3.21/inc/class-ps-public.php#L429
- plugins.trac.wordpress.org /browser/content-protector/tags/4.3.21/inc/class-ps-public.php#L294
- plugins.trac.wordpress.org /browser/content-protector/tags/4.3.21/inc/admin/inc/class-ps-meta.php#L82
- plugins.trac.wordpress.org /changeset/3793918/content-protector/trunk/inc/class-ps-public.php
Sources
- CVE List CVE-2026-125409
- NVD CVE-2026-125409
Fencer Intel 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.