Passster <= 4.3.21 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'metavalue' Parameter
Summary
| CVE | CVE-2026-125409 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-13 10:17:28 UTC |
| Updated | 2026-11-13 10:17:28 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 6.4 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS: 0.003750000 probability, percentile 0.319120000 (date 2026-11-13)
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| 3.1 | CNA | DECLARED | 6.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Wpchill | Passster Password Protect Pages And Content | affected 4.3.21 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/browser/content-protector/tags/4.3.21/inc/class-ps-public.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/content-protector/tags/4.3.21/inc/admin/inc/class-ps-... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset/3793918/content-protector/trunk/inc/class-ps-public... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/content-protector/tags/4.3.21/inc/class-ps-public.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/content-protector/tags/4.3.21/inc/class-ps-public.php | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/81cf06d2-9b5a-4f9f-adf9-890b4... | [email protected] | www.wordfence.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Wordfence PRISM (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-11-09T22:39:46.000Z | Vendor Notified |
| CNA | 2026-11-12T20:48:11.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.