CVE-2026-1781

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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
2026-03-11T01:22:03.740Z
Modified
2026-08-12T03:51:40.551511923Z
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
MC4WP: Mailchimp for WordPress <= 4.11.1 - Missing Authorization to Unauthenticated Arbitrary Subscription Deletion
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_action POST 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_action parameter, granted they can obtain the form ID (which is publicly exposed in the HTML source).

Database specific 
{
    "cwe_ids": [
        "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1781.json",
    "cna_assigner": "Wordfence"
}
References

Affected packages

Git / github.com/ibericode/mailchimp-for-wordpress

Affected ranges

Type
GIT
Repo
https://github.com/ibericode/mailchimp-for-wordpress
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5fdebc2a5e22d11287d011697a6b09331bd96fa5
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "4.11.1"
        }
    ]
}

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

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1781.json"