Simple Payment 1.3.6 — 2.3.8 - Authentication Bypass to Admin
CVE-2025-6688Published · Updated Action summary
Affected: 1.3.6 – 2.3.8Update to 2.3.9 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?
Simple Payment simple-payment
- Affected1.3.6 – 2.3.8
- Patched in2.3.9
Update to 2.3.9 or newer.
You are affected if you run 1.3.6 – 2.3.8. Version 2.3.9 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Simple Payment.
- 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 2.3.9, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Simple Payment to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to kr0d.
The Simple Payment plugin for WordPress is vulnerable to Authentication Bypass in versions 1.3.6 to 2.3.8. This is due to the plugin not properly verifying a user's identity prior to logging them in through the create_user() function. This makes it possible for unauthenticated attackers to log in as administrative users.
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 Simple Payment
All 8| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤2.5.4Update to 2.5.6 | CVE-2026-96332 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤2.5.4Update to 2.5.6 | CVE-2026-62111 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤2.5.1Update to 2.5.2 | CVE-2026-81292 | |
| Medium5.3 | Missing Authorization ≤2.5.2Update to 2.5.3 | CVE-2026-81767 | |
| High8.1 | Unauthenticated Local File Inclusion ≤2.4.6Update to 2.4.7 | CVE-2025-62075 |
- High7.2Unauthenticated Stored Cross-Site Scripting
≤2.5.4Update to 2.5.6
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤2.5.4Update to 2.5.6
- High7.2Unauthenticated Stored Cross-Site Scripting
≤2.5.1Update to 2.5.2
- Medium5.3Missing Authorization
≤2.5.2Update to 2.5.3
- High8.1Unauthenticated Local File Inclusion
≤2.4.6Update to 2.4.7
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.