Contact Manager <= 9.1.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename Blacklist Bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-109218
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 07:16:44 UTC
Updated2026-10-29 02:16:46 UTC
DescriptionThe Contact Manager plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 9.1.2 via the add_message function. This is due to an incomplete extension blacklist that fails to detect dangerous extensions when a trailing dot causes the extension-derivation routine to return an empty string, which sanitize_file_name() then silently removes before the file is written to disk. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Successful code execution additionally requires the server to use Apache with libapache2-mod-php (which maps .phar to PHP by default) and the attacker to retrieve the uploaded file within the brief window before it is removed by unlink() at end of request.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.006430000 probability, percentile 0.506990000 (date 2026-10-28)

Problem Types: CWE-434 | CWE-434 CWE-434 Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Kleor Contact Manager affected 9.1.2 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/forms/processing.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/contact-manager.php [email protected] plugins.trac.wordpress.org
fr.wordpress.org/plugins/contact-manager [email protected] fr.wordpress.org
plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/add-message.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/add-message.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/b359ef59-4c2e-4d4e-b000-18455... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: sermsak (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-12T13:58:49.000ZVendor Notified
CNA2026-10-27T18:42:18.000ZDisclosed

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