Really Simple Security Pro <= 9.5.4.0 — Authenticated (Subscriber+) Insecure Direct Object Reference
CVE-2026-27397Published · Updated Action summary
Affected: ≤9.5.4.0Update to 9.5.4.1 or newer
All remediation steps- Severity
- Medium4.3
- CVSS
- 4.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NWhat 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:LIntegrity- Low
A:NAvailability- None
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Really Simple Security Pro really-simple-ssl-pro
- Affected≤ 9.5.4.0
- Patched in9.5.4.1
Update to 9.5.4.1 or newer.
You are affected if you run ≤ 9.5.4.0. Version 9.5.4.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Really Simple Security Pro.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 9.5.4.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Really Simple Security Pro to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to dcodx.
The Really Simple Security Pro plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 9.5.4.0 due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, to perform an unauthorized action.
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 Really Simple Security Pro
All 2| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Critical9.8 | 9.1.1.1 - Authentication Bypass 9.0.0 – 9.1.1.1Update to 9.1.2 | CVE-2024-10924 |
- Critical9.89.1.1.1 - Authentication Bypass
9.0.0 – 9.1.1.1Update to 9.1.2
Timeline
CVE published
Severity medium, CVSS 4.3
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.