WordPress plugin
WPBase Cache <= 5.5.6 — Authenticated (Subscriber+) Denial of Service
CVE-2026-39767Published · Updated Action summary
Affected: ≤5.5.6Update to 5.5.7 or newer
All remediation steps- Severity
- Medium6.5
- CVSS
- 6.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:NIntegrity- None
A:HAvailability- High
- Required access
- Unknown
- Exploit prediction (EPSS)
- 0.4% chance in 30 days32th percentile
- CISA KEV
- Not listed
On this page7
Am I affected?
WPBase Cache wpbase-cache
- Affected≤ 5.5.6
- Patched in5.5.7
Update to 5.5.7 or newer.
You are affected if you run ≤ 5.5.6. Version 5.5.7 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WPBase Cache.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 5.5.7, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch WPBase Cache to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to dodoh4t.
The WPBase Cache plugin for WordPress is vulnerable to Denial of Service in all versions up to, and including, 5.5.6. This is due to insufficient validation of user supplied input. This makes it possible for authenticated attackers, with subscriber-level access and above, to make the affected site unavailable.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Timeline
CVE published
Severity medium, CVSS 6.5
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.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.