YesWiki before 4.6.7 contains an authentication bypass in the contact mail AJAX handler that allows unauthenticated attackers to send email through the wiki's SMTP server. Attackers can POST an XMLHttpRequest to the mail handler without field or type parameters, supplying arbitrary recipient, sender, subject and body for spam and phishing.

Project Subscriptions

Vendors Products
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Yeswiki Subscribe
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 02 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 02 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
Description YesWiki before 4.6.7 contains an authentication bypass in the contact mail AJAX handler that allows unauthenticated attackers to send email through the wiki's SMTP server. Attackers can POST an XMLHttpRequest to the mail handler without field or type parameters, supplying arbitrary recipient, sender, subject and body for spam and phishing.
Title YesWiki before 4.6.7 Unauthenticated Open Mail Relay via Contact Mail Handler
First Time appeared Yeswiki
Yeswiki yeswiki
Weaknesses CWE-306
CPEs cpe:2.3:a:yeswiki:yeswiki:*:*:*:*:*:*:*:*
Vendors & Products Yeswiki
Yeswiki yeswiki
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-02T14:54:38.241Z

Reserved: 2026-10-02T00:53:03.852Z

Link: CVE-2026-104446

cve-icon Vulnrichment

Updated: 2026-10-02T14:54:10.364Z

cve-icon NVD

Status : Deferred

Published: 2026-10-02T12:17:15.817

Modified: 2026-10-02T15:17:07.013

Link: CVE-2026-104446

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-02T13:00:12Z

Weaknesses