CVE-2026-120466
Received Received - Intake

Unauthenticated Subscription Changes in AcyMailing

Publication date: 2026-11-12

Last updated on: 2026-11-12

Assigner: Joomla! Project

Description
Joomla / WordPress Extension - acymailing.com - Missing authorization on subscription changes in AcyMailing 1.0.0 - 11.1.1 - An unauthenticated attacker who knows a subscriber's email address can unsubscribe that subscriber from one mailing list or from every mailing lists, without proving that the address is theirs. The affected feature also lets an attacker determine whether a given email address belongs to a subscriber of the site.

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Meta Information

Published
2026-11-12
Last Modified
2026-11-12
Generated
2026-11-12
AI Q&A
2026-11-12
EPSS Evaluated
N/A
NVD
CVE-2026-120466
EUVD
EUVD-2026-124605

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
acymailing acymailing 1.0.0
acymailing acymailing 11.1.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

This vulnerability affects the AcyMailing extension for Joomla and WordPress. It allows an unauthenticated attacker to unsubscribe a subscriber from mailing lists or check if an email address is subscribed, without verifying ownership of the email address.

Detection Guidance

Check AcyMailing logs for unusual unsubscribe requests or bulk changes to subscriber lists. Look for patterns where multiple unsubscribes occur in quick succession or from the same IP address. Verify if the unsubscribe endpoints are accessible without authentication by testing with curl commands targeting the AcyMailing subscription management URLs.

Impact Analysis

An attacker could disrupt email communications by unsubscribing users without consent. They could also confirm if an email address is registered on the site, potentially aiding phishing or targeted attacks.

Compliance Impact

This vulnerability may violate GDPR by allowing unauthorized changes to subscriber data and enabling email address discovery without consent. It could also breach HIPAA if used to access protected health information distribution lists.

Mitigation Strategies

Update AcyMailing to the latest version that patches this vulnerability. If an update is not immediately available, disable the unsubscribe functionality or restrict access to subscription management endpoints via server-side authentication. Review server logs for signs of exploitation and block suspicious IP addresses attempting to access these endpoints.

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