CVE-2026-115806: Insecure Deserialization (CVSS 9.8)

Description

The Prime Mover – Backup and Migration plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.2.1 via deserialization of untrusted input in the migration search-and-replace routine (recursiveUnserializeReplace()). An unauthenticated attacker can store a crafted, base64-encoded serialized object in wp_comments.comment_content through the standard comment-submission endpoint (wp-comments-post.php). When an administrator subsequently performs a routine Prime Mover export or restore, the plugin base64-decodes that stored value and passes it to unserialize() with no allowed_classes restriction. A Property-Oriented Programming (POP) chain is present in the plugin's own bundled Freemius library (FS_Clone_Manager::__set → FS_Option_Manager::set_option → store() → update_option()), so no additional plugin or theme is required — the plugin ships the gadget itself.

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CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0055

Probability of exploitation

0.46%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

References

Other References

https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L1281 https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L391 https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L422 https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L899 https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/vendor/freemius/includes/managers/class-fs-clone-manager.php#L1636 https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/vendor/freemius/includes/managers/class-fs-option-manager.php#L414 https://www.wordfence.com/threat-intel/vulnerabilities/id/ab6ebd66-c7a4-402e-b51e-3f1f3183bd97?source=cve

Frequently Asked Questions

What is CVE-2026-115806? +

The Prime Mover – Backup and Migration plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.2.1 via deserialization of untrusted input in the migration search-and-replace routine (recursiveUnserializeReplace()). An unauthenticated attacker can store a crafted, base64-encoded serialized object in wp_comments.comment_content through the standard comment-submission endpoint (wp-comments-post.php). When an administrator subsequently performs a routine Prime Mover export or restore, the plugin base64-decodes that stored value and passes it to unserialize() with no allowed_classes restriction. A Property-Oriented Programming (POP) chain is present in the plugin's own bundled Freemius library (FS_Clone_Manager::__set → FS_Option_Manager::set_option → store() → update_option()), so no additional plugin or theme is required — the plugin ships the gadget itself. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-115806? +

CVE-2026-115806 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0055, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-115806? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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