FluentBoards <= 1.47 — Unauthenticated PHP Object Injection
CVE-2025-39551Published · Updated Action summary
Affected: ≤1.47Update to 1.48 or newer
All remediation steps- Severity
- Critical9.8
- CVSS
- 9.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-502 PHP Object Injection
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
FluentBoards – Project Management, Task Management, Goal Tracking, Kanban Board, and, Team Collaboration fluent-boards
- Affected≤ 1.47
- Patched in1.48
Update to 1.48 or newer.
You are affected if you run ≤ 1.47. Version 1.48 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under FluentBoards – Project Management, Task Management, Goal Tracking, Kanban Board, and, Team Collaboration.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 1.48, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch FluentBoards – Project Management, Task Management, Goal Tracking, Kanban Board, and, Team Collaboration to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Trương Hữu Phúc (truonghuuphuc).
The FluentBoards plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 1.47 via deserialization of untrusted input. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in FluentBoards – Project Management, Task Management, Goal Tracking, Kanban Board, and, Team Collaboration
All 11| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Missing Authorization ≤2.2.2Update to 2.3.0 | CVE-2026-119486 | |
| Medium4.3 | Missing Authorization ≤2.1.0Update to 2.2.0 | CVE-2026-109696 | |
| Medium6.3 | Authenticated (Subscriber+) Privilege Escalation ≤2.0.12Update to 2.0.15 | CVE-2026-96821 | |
| Medium5.3 | 2.0.15 - Unauthenticated Information Exposure 1.95 – 2.0.15Update to 2.1.0 | CVE-2026-89331 | |
| Medium4.3 | Authenticated (Subscriber+) Information Exposure ≤2.0.14Update to 2.0.15 | CVE-2026-85349 |
- Medium4.3Missing Authorization
≤2.2.2Update to 2.3.0
- Medium4.3Missing Authorization
≤2.1.0Update to 2.2.0
- Medium6.3Authenticated (Subscriber+) Privilege Escalation
≤2.0.12Update to 2.0.15
- Medium5.32.0.15 - Unauthenticated Information Exposure
1.95 – 2.0.15Update to 2.1.0
- Medium4.3Authenticated (Subscriber+) Information Exposure
≤2.0.14Update to 2.0.15
Same weakness (PHP Object Injection)
All PHP Object Injection| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity critical, CVSS 9.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.