CVE-2025-11876 json
Mailgun Subscriptions <= 1.3.1 - Authenticated (Contributor+) Stored Cross-Site Scripting
published 2025-12-12 10 mo ago modified 2026-10-07 32 d ago also EUVD-2025-203054
- 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 12%
- public exploits
- 0
- none known
Summary
The Mailgun Subscriptions plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'mailgun_subscription_form' shortcode in all versions up to, and including, 1.3.1 due to insufficient input sanitization and output escaping on user supplied attributes. 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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 10 mo ago
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 12% 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
- jbrinley Mailgun Subscriptions
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- github.com /flightless/mailgun-subscriptions/pull/8/commits/a8b597e3a09f3a1b76436d09de434fd9bfe29f64
- wordfence.com /threat-intel/vulnerabilities/id/149e60cc-9612-4651-b02d-4b68a3533d36?source=cve
- plugins.trac.wordpress.org /browser/mailgun-subscriptions/tags/1.2.0/Mailgun_Subscriptions/Subscription_Form.php#L101
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3413662%40mailgun-subscriptions&new=3413662%40mailgun-subscript
Sources
- CVE List CVE-2025-11876
- NVD CVE-2025-11876
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