CVE-2026-115806

Prime Mover <= 2.2.1 - Unauthenticated PHP Object Injection via Base64-Encoded Comment during Migration Search-and-Replace

Critical 9.8

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.

Assigner
Wordfence

Published
2026-10-24

Updated
2026-10-24

Reserved
2026-10-23

Scores

Source	CVSS	Score	Severity	Vector
Wordfence	3.1	9.8	Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-502

Affected

Vendor	Product	Versions
codexonics	Prime Mover – Backup and Migration	<= 2.2.1 (affected) others: unaffected

References

Full CVE JSON record (5.2)

API · GitHub · cve.org

{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Prime Mover \u2013 Backup and Migration",
          "vendor": "codexonics",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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      "credits": [
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          "type": "finder",
          "value": "Civitasmass"
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      "descriptions": [
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          "lang": "en",
          "value": "The Prime Mover \u2013 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\u0027s own bundled Freemius library (FS_Clone_Manager::__set \u2192 FS_Option_Manager::set_option \u2192 store() \u2192 update_option()), so no additional plugin or theme is required \u2014 the plugin ships the gadget itself."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "type": "CWE"
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      "providerMetadata": {
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        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/ab6ebd66-c7a4-402e-b51e-3f1f3183bd97?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L1281"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L391"
        },
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        },
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          "url": "https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L422"
        },
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          "url": "https://plugins.trac.wordpress.org/browser/prime-mover/tags/2.2.1/utilities/PrimeMoverSearchReplace.php#L899"
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      ],
      "timeline": [
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          "lang": "en",
          "time": "2026-10-11T04:53:07.000Z",
          "value": "Vendor Notified"
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          "lang": "en",
          "time": "2026-10-22T20:18:57.000Z",
          "value": "Disclosed"
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      ],
      "title": "Prime Mover \u003c= 2.2.1 - Unauthenticated PHP Object Injection via Base64-Encoded Comment during Migration Search-and-Replace"
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    "dateReserved": "2026-10-23T16:04:41.449Z",
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