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PatchSiren cyber security CVE debrief

CVE-2026-102562 acyba CVE debrief

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.

Vendor
acyba
Product
AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for WordPress installations with the AcyMailing plugin should assess exposure and prioritize verification of input sanitization and output escaping measures. This includes reviewing the effectiveness of current measures to prevent potential Stored Cross-Site Scripting attacks and ensuring that administrators are aware of the potential risks.

Why it matters

Defenders should prioritize verifying exposure of AcyMailing plugin versions up to 11.1.0 and assess the effectiveness of current input sanitization and output escaping measures to prevent potential Stored Cross-Site Scripting attacks.

  • Potential for unauthenticated attackers to inject arbitrary web scripts
  • Possible execution of injected scripts when a user accesses the online-archive URL for the poisoned subscriber
  • Potential for administrators to be affected when clicking plugin-generated links in the Subscribers → History screen

Technical summary

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. The vulnerability allows 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.

Defensive priority

Defenders should prioritize verifying exposure of AcyMailing plugin versions up to 11.1.0 and assess the effectiveness of current input sanitization and output escaping measures.

Recommended defensive actions

  • Verify AcyMailing plugin version and update to a patched version if necessary
  • Assess input sanitization and output escaping measures for the customField[] parameter
  • Monitor for potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including the affected versions and the root cause of the issue. Defenders should verify the AcyMailing plugin version and assess input sanitization and output escaping measures. Limited source detail is provided; explicit evidence limits and defensive verification tasks are required.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102562 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102562

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-102562 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102562

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • AcyMailing <= 11.1.0 - Unauthenticated Stored Cross-Site Scripting via 'customField[]' Parameter

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/102xxx/CVE-2026-102562.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/front/FrontViews/Archive/tmpl/view.php

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/dynamics/subscriber/SubscriberInsertion.php

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/Classes/FieldClass.php

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/Core/wordpress/security.php

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/back/Classes/UserClass.php

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/acymailing/tags/11.1.0/front/FrontControllers/FrontusersController.php

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.