Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-102435 Overview
The Ultra Addons for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the _getObjAttr function in all versions up to, and including, 3.5.54. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). This requires the PDF Generator add-on to be active and a Contact Form 7 form to be configured for PDF generation, as the WPCF7_Submission POP gadget chain relies on CF7 being present to complete the file deletion via __destruct(). Note: This vulnerability can only be exploited when the PDF generator feature is enabled.
Critical Impact
Affected Products
- Ultra Addons for Contact Form: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-02: CVE-2026-102435 published to the National Vulnerability Database by security@wordfence.com
- 2026-11-02: last updated in the NVD database
Technical Details for CVE-2026-102435
Vulnerability Analysis
CVE-2026-102435 is a Deserialization of Untrusted Data weakness (CWE-502: Deserialization of Untrusted Data) in Ultra Addons for Contact Form. Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. The application rebuilds objects from attacker controlled data, which can run code.
With a CVSS base score of 9.8, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-502: Deserialization of Untrusted Data. The application rebuilds objects from attacker controlled data, which can run code.
Attack Vector
Based on the CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Attack complexity is low complexity.
No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Detection Methods for CVE-2026-102435
Detection Strategies
- Inventory every instance of Ultra Addons for Contact Form and compare the running version with the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Run an authenticated vulnerability scan once your scanner ships a check for this CVE.
Monitoring Recommendations
- Forward Ultra Addons for Contact Form application, access and audit logs to your SIEM for retrospective hunting.
- Alert on new processes, configuration changes or outbound connections from the affected service.
- Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.
How to Mitigate CVE-2026-102435
Immediate Actions Required
- Apply the fixed version of Ultra Addons for Contact Form named in the vendor advisory.
- Prioritize internet facing and business critical instances first.
- Rescan after the change to confirm the exposure is closed.
Patch Information
Use the fixed version listed in the vendor advisory for Ultra Addons for Contact Form.
Workarounds
- If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.
CWE References
- CWE-502: Deserialization of Untrusted Data More CVEs with this weakness
Technical References
This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.
Frequently asked questions
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