Resource exhaustion in Really Simple Security

CVE-2026-88798

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.

Vulnerability class: DoS (Denial of Service)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (36.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-88798: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

  • Really Simple Security

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-88798?
CVE-2026-88798 is a medium-severity vulnerability in Really Simple Security, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-09-18.
How severe is CVE-2026-88798?
Medium severity. CVSS v3 base score is 5.3 out of 10.