Prime Mover <= 2.2.1 - Unauthenticated PHP Object Injection via Base64-Encoded Comment during Migration Search-and-Replace
CVSS score
9.8
EPSS probability
—
Risk score
1.0
Published
4 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%53
Short explanation
In Prime Mover – Backup and Migration versions up to 2.2.1, an attacker can post a comment via wp‑comments‑post.php and store a crafted base64‑encoded serialized object in wp_comments.comment_content. When an administrator runs the plugin’s export or restore function, the value is base64‑decoded and passed to an unrestricted unserialize(), triggering a POP chain in the bundled Freemius library that leads to remote code execution and full site compromise. (S0,S1)
The flaw enables unauthenticated attackers to fully compromise the site, putting critical data and services at risk. (S0)
What should be done?
- Monitor and block suspicious base64 payloads in comments
- Disable unauthenticated comment posting or enforce moderation
- Apply vendor patch when available (follow official advisory)
- Consider removing or replacing the Prime Mover plugin
- Deploy a WAF to filter serialized object injections
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
CVE-2026-115806, Prime Mover eklentisinin 2.2.1 ve öncesi sürümlerinde kimlik doğrulama gerektirmeyen PHP Object Injection açığı içerir. (S0,S1)
Bu açık, saldırganın wp‑comments‑post.php üzerinden yorum göndererek özel bir base64‑kodlu nesne yerleştirmesine ve ardından yönetici dışa aktarım/geri yükleme yaptığında uzaktan kod yürütmesine izin verir. (S0,S1)
CISA KEV listesinde yer almamaktadır; aktif istismar raporlanmamıştır. (S0)
Yama durumu UNKNOWN olarak belirtilmiş; resmi bir düzeltme henüz doğrulanmamıştır. (S0)
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-502
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-115806 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Codexonics | Prime Mover – Backup and Migration | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.8 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD |
| 9.8 | CVSS V3_1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-115806 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-115806 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
9.8 / 10Vulnerability Scoring Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HYama durumu bilinmiyor
Weakness Type (CWE & CAPEC)
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