CVE-2026-3995 json
OPEN-BRAIN <= 0.5.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'API Key' Setting
published 2026-04-16 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-23213
- cvss
- 4.4
- 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 28%
- public exploits
- 0
- none known
Summary
The OPEN-BRAIN plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'API Key' settings field in all versions up to, and including, 0.5.0. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_text_field() which strips HTML tags but does not encode double quotes or other HTML-special characters needed for safe attribute context output. The API key value is saved via update_option() and later output into an HTML input element's value attribute without esc_attr() escaping. This makes it possible for authenticated attackers, with Administrator-level access, to inject arbitrary web scripts via attribute breakout payloads (e.g., double quotes followed by event handlers) that execute whenever a user accesses the plugin settings page.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.4 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N |
Affected products
- faridsaniee OPEN-BRAIN
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/3fe3fa95-cc1d-469b-8a97-37987b9ae362?source=cve
- plugins.trac.wordpress.org /browser/open-brain/trunk/index.php#L272
- plugins.trac.wordpress.org /browser/open-brain/tags/0.5.0/index.php#L272
- plugins.trac.wordpress.org /browser/open-brain/trunk/index.php#L252
- plugins.trac.wordpress.org /browser/open-brain/tags/0.5.0/index.php#L252
- plugins.trac.wordpress.org /browser/open-brain/trunk/index.php#L253
- plugins.trac.wordpress.org /browser/open-brain/tags/0.5.0/index.php#L253
- plugins.trac.wordpress.org /browser/open-brain/trunk/index.php#L128
- plugins.trac.wordpress.org /browser/open-brain/tags/0.5.0/index.php#L128
Sources
- CVE List CVE-2026-3995
- NVD CVE-2026-3995
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.