Quick answers
- Is CVE-2026-88798 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-88798 being exploited in the wild.
- How severe is CVE-2026-88798?
- Medium severity, with a CVSS score of 5.3, published 18 September 2026.
- Which products and versions are affected?
- Really Simple Security Really Simple Security before 9.8.3.
- Is there a fix for CVE-2026-88798?
- A patch was published on 2026-09-18: Fixed in version 9.8.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-88798 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-88798?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an unbounded option growth denial of service (DoS) caused by insufficient input validation. The plugin uses client-supplied address values (such as IP headers) directly as storage keys in WordPress options without validation or sanitization. An unauthenticated attacker can exploit this by sending requests with varying spoofed IP addresses, causing the plugin to create new entries without limit. This is a network-based attack requiring no authentication or user interaction. The result is resource exhaustion as the option grows without bounds, degrading the site's performance when processing 404 requests. Fixed in version 9.8.3.
Affected products
- Really Simple Security Really Simple Security before 9.8.3
Timeline
- 2026-09-18: disclosed: Published on NVD
- 2026-09-16: advisory: Publicly published on WPScan
- 2026-09-18: patched: Fixed in version 9.8.3