WordPress plugin
Jetpack – WP Security, Backup, Speed, & Growth < 4.2 — Timing Attack
fc6dcf93-7f1f-4e87-8ba5-852d23b1f0fdPublished · Updated Action summary
Affected: <4.2Update to 4.2 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?
Jetpack – AI Agents & MCP, Security, Backup & Analytics jetpack
- Affected< 4.2
- Patched in4.2
Update to 4.2 or newer.
You are affected if you run < 4.2. Version 4.2 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Jetpack – AI Agents & MCP, Security, Backup & Analytics.
- 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 4.2, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Jetpack – AI Agents & MCP, Security, Backup & Analytics to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Scott Arciszewski.
The Jetpack plugin for WordPress is vulnerable to timing attacks in versions up to, and including, 4.1.x. This is due to lack of a safe string comparison function.
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 Jetpack – AI Agents & MCP, Security, Backup & Analytics
All 33| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Missing Authorization ≤16.2Update to 16.3 | CVE-2026-106601 | |
| Medium5.3 | Missing Authorization ≤16.2Update to 16.3 | CVE-2026-106602 | |
| High7.2 | 16.1.2 - Unauthenticated Stored Cross-Site Scripting 16.1 – 16.1.2Update to 16.1.3 | — | |
| Medium6.6 | 16.1.2 - Authenticated (Administrator+) PHP Object Injection 16.1 – 16.1.2Update to 16.1.3 | — | |
| Medium6.6 | 16.1.2 - Authenticated (Administrator+) PHP Object Injection 16.1 – 16.1.2Update to 16.1.3 | — |
- Medium5.3Missing Authorization
≤16.2Update to 16.3
- Medium5.3Missing Authorization
≤16.2Update to 16.3
- High7.216.1.2 - Unauthenticated Stored Cross-Site Scripting
16.1 – 16.1.2Update to 16.1.3
- Medium6.616.1.2 - Authenticated (Administrator+) PHP Object Injection
16.1 – 16.1.2Update to 16.1.3
- Medium6.616.1.2 - Authenticated (Administrator+) PHP Object Injection
16.1 – 16.1.2Update to 16.1.3
Timeline
CVE published
Severity critical, CVSS 9.8
Record last updated
Sources & licenses
- Vulnerability data
- Wordfence Intelligence. [object Object] 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.