Vulnerability · Published Sep 18, 2026 · Assigned by WPScan
CVE-2026-88798Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofed Client IP Header
Medium 5.3
In plain English
A medium-severity uncontrolled resource consumption in Really Simple Security from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 63.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The Really Simple Security WordPress plugin before 9.8.3 does not validate a client-supplied address value before using it as a storage key in one of its own options, allowing unauthenticated attackers to grow that option without bound and to slow the site's handling of missing pages.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Really Simple Security | 8.1.6 – before 9.8.3 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- https://wpscan.com/vulnerability/e658dcd2-2ff6-4611-a28d-e2482c65be8b/ exploit, vdb-entry, technical-description