Support Board <= 3.8.0 — Unauthenticated Authorization Bypass due to Use of Default Secret Key
CVE-2025-4855Published · Updated Action summary
Affected: ≤3.8.0Update to 3.8.1 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
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Support Board supportboard
- Affected≤ 3.8.0
- Patched in3.8.1
Update to 3.8.1 or newer.
You are affected if you run ≤ 3.8.0. Version 3.8.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Support Board.
- 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 3.8.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Support Board to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Foxyyy.
The Support Board plugin for WordPress is vulnerable to unauthorized access/modification/deletion of data due to use of hardcoded default secrets in the sb_encryption() function in all versions up to, and including, 3.8.0. This makes it possible for unauthenticated attackers to bypass authorization and execute arbitrary AJAX actions defined in the sb_ajax_execute() function. An attacker can use this vulnerability to exploit CVE-2025-4828 and various other functions unauthenticated.
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 Support Board
All 12| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Critical9.8 | Unauthenticated Privilege Escalation <3.8.9Update to 3.8.9 | CVE-2026-27395 | |
| Medium6.1 | Reflected Cross-Site Scripting <3.8.7Update to 3.8.7 | CVE-2025-60182 | |
| Medium6.1 | Reflected Cross-Site Scripting ≤3.8.0Update to 3.8.1 | CVE-2025-54027 | |
| High8.1 | Unauthenticated Local File Inclusion ≤3.8.0Update to 3.8.1 | CVE-2025-54031 | |
| Critical9.8 | Unauthenticated Arbitrary File Deletion ≤3.8.0Update to 3.8.1 | CVE-2025-4828 |
- Critical9.8Unauthenticated Privilege Escalation
<3.8.9Update to 3.8.9
- Medium6.1Reflected Cross-Site Scripting
<3.8.7Update to 3.8.7
- Medium6.1Reflected Cross-Site Scripting
≤3.8.0Update to 3.8.1
- High8.1Unauthenticated Local File Inclusion
≤3.8.0Update to 3.8.1
- Critical9.8Unauthenticated Arbitrary File Deletion
≤3.8.0Update to 3.8.1
Timeline
CVE published
Severity critical, CVSS 9.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. 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.