Stored cross-site scripting in AcyMailing WordPress plugin
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The AcyMailing plugin for WordPress by acyba is vulnerable to stored cross-site scripting in versions up to and including 11.1.0. Insufficient input sanitization and output escaping in the acym_cleanVar() sanitizer let an unauthenticated attacker store script content in a subscriber field through the public subscribe form. The stored script runs whenever a user opens the online archive URL for the poisoned subscriber, including administrators who click the plugin-generated link in the Subscribers History screen. This is classified as CWE-79.
Written with Claude Haiku 5.5 from the sources below · 2026-10-27
Description from the CNA
The AcyMailing plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the customField[] parameter of the public frontusers::subscribe endpoint in versions up to, and including, 11.1.0. This is due to insufficient input sanitization and output escaping in the acym_cleanVar() sanitizer, whose HTML-tag stripper only matches complete tags (requiring a closing '>'), together with SubscriberInsertion::replaceUserInformation() and the archive view template, which substitute the stored subscriber field value into the mail body and emit it without HTML encoding. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses the online-archive URL for the poisoned subscriber, including administrators who click the plugin-generated link in the Subscribers → History screen.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| acyba | AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress | up to 11.1.0 | — | No fix listed | CNA |
- AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress Vendoracyba Affected up to 11.1.0 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for AcyMailing.
Written with Claude Haiku 5.5 from the sources below · 2026-10-27
Timeline
- 2026-10-13 Threatist record created from CVE-2026-102562
- 2026-10-13 Alias added: GHSA-qqxc-3cx7-qv45
- 2026-10-13 Priority changed: MEDIUM → LOW
- 2026-10-16 CISA SSVC decision points changed
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/eb8f03fb-d1af-4727-87d7-58dbe4013d8a?source=cve
- https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/front/FrontViews/Archive/tmpl/view.php#L17
- https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/dynamics/subscriber/SubscriberInsertion.php#L159
- https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/Classes/FieldClass.php#L292
- https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/Core/wordpress/security.php#L122
- https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/Classes/UserClass.php#L1187
- https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/front/FrontControllers/FrontusersController.php#L69
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3729031%40acymailing&new=3729031%40acymailing
More acyba vulnerabilities
- TI-2023-20863 Extension - acymailing.com - RCE in AcyMailing component for Joomla 6.7.0-8.5.0 CVSS 3.1CRITICAL 9.8
- TI-2018-06612 CSV Injection (aka Excel Macro Injection or Formula Injection) exists in the export… CVSS 3.0HIGH 8.8
- TI-2018-06611 CSV Injection (aka Excel Macro Injection or Formula Injection) exists in the export… CVSS 3.0HIGH 8.8
- TI-2024-06844 AcyMailing <= 9.7.2 - Authenticated (Subscriber+) Arbitrary File Upload via acym_extractArchive Function CVSS 3.1HIGH 8.8
- TI-2026-54189 Path traversal in acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing… CVSS 3.1HIGH 7.5
- TI-2026-12981 Improper privilege management in acyba AcyMailing – An Ultimate Newsletter Plugin and… CVSS 3.1HIGH 8.8
Sources
- CVE-2026-102562 · CVE Program
- CVE-2026-102562 · NVD
- FIRST EPSS
- GHSA-qqxc-3cx7-qv45 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences