CVE-2026-81766
Last modified
CVE-2026-81766 is a medium-severity vulnerability rated 6.6/10 on the CVSS scale. The Really Simple Security WordPress plugin before 9.8.0 does not check that the user is allowed to install Really Simple Security WordPress plugin before 9.8.0 before installing one from a user-supplied URL, allowing an administrator of a subsite on a multisite network to install and execute arbitrary code in the network-shared Really Simple Security WordPress plugin before 9.8.0 directory, which WordPress otherwise reserves to the network administrator. Exploitation requires the network administrator to have enabled the Really Simple Security WordPress plugin before 9.8.0 administration menu for subsites, which is not the default.. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
Description
The Really Simple Security WordPress plugin before 9.8.0 does not check that the user is allowed to install Really Simple Security WordPress plugin before 9.8.0 before installing one from a user-supplied URL, allowing an administrator of a subsite on a multisite network to install and execute arbitrary code in the network-shared Really Simple Security WordPress plugin before 9.8.0 directory, which WordPress otherwise reserves to the network administrator. Exploitation requires the network administrator to have enabled the Really Simple Security WordPress plugin before 9.8.0 administration menu for subsites, which is not the default.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Really Simple Security | < 9.8.0 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-81766?
How severe is CVE-2026-81766?
How do I fix CVE-2026-81766?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-81760Improper Neutralization of Input During Web Page Generation …7.1
- CVE-2026-81761Subscriber Broken Access Control in WpEvently <= 5.5.0 versi…4.3
- CVE-2026-81762Subscriber Broken Access Control in Booking and Rental Manag…6.5
- CVE-2026-81763Unauthenticated SQL Injection in Throws SPAM Away <= 3.8.2 v…9.3
- CVE-2026-81764Unauthenticated Cross Site Scripting (XSS) in Email Essentia…7.1
- CVE-2026-81765Unauthenticated Cross Site Scripting (XSS) in Tailored Tools…7.1
- CVE-2026-81767Unauthenticated Broken Access Control in Simple Payment <= 2…7.5
- CVE-2026-81768Unauthenticated Cross Site Scripting (XSS) in Super Store Fi…7.1
- CVE-2026-81769Incorrect Privilege Assignment vulnerability in LiquidThemes…8.8
- CVE-2026-8177XML::LibXML versions through 2.0210 for Perl read out-of-bou…7.5
- CVE-2026-81770Unauthenticated Cross Site Scripting (XSS) in Interactive Ge…7.1
- CVE-2026-81771Unauthenticated Cross Site Scripting (XSS) in TrustedSite <=…7.1
Are you affected by CVE-2026-81766?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST