WordPress Core 4.7.0-6.3.1 — Denial of Service via Cache Poisoning
bdc84664-2a04-4cc6-ac3f-48bfd432691fPublished · Updated Action summary
Affected: ≤6.3.1Update to 4.7.27 or 4.8.23 or 4.9.24 or 5.0.20 or 5.1.17 or 5.2.19 or 5.3.16 or 5.4.14 or 5.5.13 or 5.6.12 or 5.7.10 or 5.8.8 or 5.9.8 or 6.0.6 or 6.1.4 or 6.2.3 or 6.3.2 or newer
Fixed versions are per release branch: update to the fix for the branch you run.
All remediation stepsOn this page3
Overview
- Advisory ID
- bdc84664-2a04-4cc6-ac3f-48bfd432691f
- Product
- WordPress wordpress
- Affected
- ≤6.3.1
- Fixed in
- 4.7.27, 4.8.23, 4.9.24, 5.0.20, 5.1.17, 5.2.19, 5.3.16, 5.4.14, 5.5.13, 5.6.12, 5.7.10, 5.8.8, 5.9.8, 6.0.6, 6.1.4, 6.2.3, 6.3.2
- Weakness
- CWE-1250 Improper Preservation of Consistency Between Independent Representations of Shared State
- Required access
- No account needed
- Published
- · updated
- Credit
- s5s, raouf_maklouf
- Affected≤ 6.3.1
- Patched in4.7.27 / 4.8.23 / 4.9.24 / 5.0.20 / 5.1.17 / 5.2.19 / 5.3.16 / 5.4.14 / 5.5.13 / 5.6.12 / 5.7.10 / 5.8.8 / 5.9.8 / 6.0.6 / 6.1.4 / 6.2.3 / 6.3.2
Update to 4.7.27 / 4.8.23 / 4.9.24 / 5.0.20 / 5.1.17 / 5.2.19 / 5.3.16 / 5.4.14 / 5.5.13 / 5.6.12 / 5.7.10 / 5.8.8 / 5.9.8 / 6.0.6 / 6.1.4 / 6.2.3 / 6.3.2 or newer.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:NIntegrity- None
A:LAvailability- Low
WordPress Core is vulnerable to Denial of Service via Cache Poisoning in versions between 4.7.0 and 6.3.1. In cases where the X-HTTP-Method-Override header was sent in a request to a REST endpoint and the endpoint returned a 4xx error, the error could be cached, resulting in denial of service.
Not sure which version you run? Run a passive check — it reads public files only.
Remediation & mitigations
- Update to one of the following versions, or a newer patched version: 4.7.27, 4.8.23, 4.9.24, 5.0.20, 5.1.17, 5.2.19, 5.3.16, 5.4.14, 5.5.13, 5.6.12, 5.7.10, 5.8.8, 5.9.8, 6.0.6, 6.1.4, 6.2.3, 6.3.2
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
References & provenance
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 5.3
Record last updated
Sources & licenses
Sources & licenses
- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- 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.