Really Simple Security – Simple and Performant Security (formerly Really Simple SSL) <= 9.8.0 — Unauthenticated Denial of Service
CVE-2026-84775Published · Updated Action summary
Affected: ≤9.8.0Update to 9.8.1 or newer
All remediation steps- Severity
- High7.5
- CVSS
- 7.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:NConfidentiality- None
I:NIntegrity- None
A:HAvailability- High
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Really Simple Security – Simple and Performant Security (formerly Really Simple SSL) really-simple-ssl
- Affected≤ 9.8.0
- Patched in9.8.1
Update to 9.8.1 or newer.
You are affected if you run ≤ 9.8.0. Version 9.8.1 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 – Simple and Performant Security (formerly Really Simple SSL).
- 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 9.8.1, 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 – Simple and Performant Security (formerly Really Simple SSL) to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Ananda Dhakal.
The Really Simple Security – Simple and Performant Security (formerly Really Simple SSL) plugin for WordPress is vulnerable to Denial of Service in all versions up to, and including, 9.8.0. This is due to insufficient validation of user supplied input. This makes it possible for unauthenticated attackers 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
Related CVEs
More in Really Simple Security – Simple and Performant Security (formerly Really Simple SSL)
All 13| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Unauthenticated Unbounded Option Growth ≤9.8.2Update to 9.8.3 | CVE-2026-88798 | |
| Medium4.3 | Missing Authorization to 2FA Bypass ≤9.8.1Update to 9.8.2 | CVE-2026-82519 | |
| Medium5.3 | Unauthenticated Two-Factor Authentication Bypass ≤9.8.0Update to 9.8.1 | CVE-2026-89080 | |
| Medium5.3 | Unauthenticated Two-Factor Authentication Bypass ≤9.8.0Update to 9.8.1 | CVE-2026-84777 | |
| High8.8 | Authenticated (Custom Role+) Remote Code Execution <9.8.0Update to 9.8.0 | CVE-2026-81766 |
- Medium5.3Unauthenticated Unbounded Option Growth
≤9.8.2Update to 9.8.3
- Medium4.3Missing Authorization to 2FA Bypass
≤9.8.1Update to 9.8.2
- Medium5.3Unauthenticated Two-Factor Authentication Bypass
≤9.8.0Update to 9.8.1
- Medium5.3Unauthenticated Two-Factor Authentication Bypass
≤9.8.0Update to 9.8.1
- High8.8Authenticated (Custom Role+) Remote Code Execution
<9.8.0Update to 9.8.0
Timeline
CVE published
Severity high, CVSS 7.5
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.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.