CVE-2026-88798

Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofed Client IP Header

Published Sep 18, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Really-simple-plugins
Really-simple-plugins really Simple Security
Wordpress
Wordpress wordpress
Vendors & Products Really-simple-plugins
Really-simple-plugins really Simple Security
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Weaknesses CWE-400
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofed Client IP Header
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Sep 18, 2026, 11:09 AM
Reserved
Sep 10, 2026, 8:22 AM
Status
Deferred
Published
Sep 18, 2026, 6:16 AM
Modified
Sep 18, 2026, 7:08 PM