CVE-2026-1781
- Source
- https://cve.org/CVERecord?id=CVE-2026-1781
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1781.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-1781
- Published
- 2026-03-11T02:16:03.493Z
- Modified
- 2026-04-10T05:38:09.830171Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L CVSS Calculator
- Summary
- [none]
- Details
-
The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 4.11.1. This is due to the plugin trusting the
_mc4wp_actionPOST parameter without validation, allowing unauthenticated attackers to force the form to process unsubscribe actions instead of subscribe actions. This makes it possible for unauthenticated attackers to arbitrarily unsubscribe any email address from the connected Mailchimp audience via the_mc4wp_actionparameter, granted they can obtain the form ID (which is publicly exposed in the HTML source). - References
-
- https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/tags/4.11.1/includes/forms/class-form.php#L461
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3477825%40mailchimp-for-wp%2Ftrunk&old=3443118%40mailchimp-for-wp%2Ftrunk&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/10262aa9-5656-4a2b-aeb5-060018798369?source=cve
- https://cwe.mitre.org/data/definitions/862.html
- https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/tags/4.11.1/includes/forms/class-form-listener.php#L207
- https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/tags/4.11.1/includes/forms/class-form-listener.php#L53
- https://github.com/ibericode/mailchimp-for-wordpress/commit/5fdebc2a5e22d11287d011697a6b09331bd96fa5
Affected packages
Git / github.com/ibericode/mailchimp-for-wordpress
Affected ranges
- Type
- GIT
- Repo
- https://github.com/ibericode/mailchimp-for-wordpress
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
Affected versions
2.*
2.0.2
2.0.3
2.0.4
2.0.5
2.1
2.1.1
2.1.2
2.1.4
2.1.6
2.1.7
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
2.3
2.3.1
2.3.10
2.3.11
2.3.12
2.3.13
2.3.14
2.3.15
2.3.16
2.3.17
2.3.18
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.3.9
3.*
3.0.10
3.0.11
3.0.12
3.0.2
3.0.3
3.0.4
3.0.6
3.0.7
3.0.8
3.0.9
3.1
3.1.1
3.1.2
3.1.3
4.*
4.0
4.0.1
4.0.10
4.0.11
4.0.12
4.0.13
4.0.2
4.0.3
4.0.4
4.0.5
4.0.6
4.0.7
4.0.9
4.1.0
4.1.1
4.1.10
4.1.12
4.1.13
4.1.14
4.1.2
4.1.3
4.1.4
4.1.6
4.1.7
4.1.9
4.10.0
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.10.6
4.10.7
4.10.8
4.10.9
4.11.0
4.11.1
4.2.5
4.3
4.3.3
4.4
4.5.0
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.6.0
4.6.2
4.7
4.7.1
4.7.3
4.7.4
4.7.5
4.7.6
4.7.7
4.7.8
4.8
4.8.1
4.8.10
4.8.11
4.8.12
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.8.8
4.8.9
4.9.0
4.9.1
4.9.10
4.9.11
4.9.12
4.9.13
4.9.14
4.9.15
4.9.16
4.9.17
4.9.18
4.9.19
4.9.2
4.9.20
4.9.21
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
4.9.8
4.9.9