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CVE-2026-88798— Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofed Client IP Header

Quick assessment

Affected
Unknown Really Simple Security
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Really Simple Security 插件在 9.8.3 版本之前，在将客户端提供的地址值用作其某个选项的存储键之前，未对其进行验证。这使得未认证的攻击者能够无限制地扩大该选项的规模，从而拖慢网站对缺失页面的处理速度。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.42% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Really Simple Security 8.1.6< 9.8.3 affected
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I. Basic Information for CVE-2026-88798

Vulnerability Information
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Vulnerability Title
Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofed Client IP Header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Really Simple Security 8.1.6 ~ 9.8.3 -

II. Public POCs for CVE-2026-88798

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III. Intelligence Information for CVE-2026-88798

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Other References for CVE-2026-88798 (1)

Same Patch Batch · Unknown · 2026-09-18 · 32 CVEs total

CVE-2026-88994 6.6 MEDIUM All Bootstrap Blocks 1.3.20 - 1.3.31 - Contributor+ LFI via lightspeed Block Attributes
CVE-2026-79713 6.5 MEDIUM Breeze Cache 1.2.5 - 2.5.14 - Unauthenticated Cache Poisoning via Unkeyed Tracking Paramet
CVE-2026-90977 5.3 MEDIUM Clean Login < 1.19 - Unauthenticated CAPTCHA Bypass via Empty Session Comparison
CVE-2026-90976 5.3 MEDIUM Clean Login < 1.19 - Unauthenticated Account Creation with Registration Disabled
CVE-2026-86800 5.3 MEDIUM WP Ghost (Hide My WP Ghost) < 7.0.11 - Unauthenticated URL Hiding Bypass via Loopback Comp
CVE-2026-86796 5.3 MEDIUM WP Ghost (Hide My WP Ghost) 7.0.10 - Unauthenticated Firewall, Threat Detection and URL Hi
CVE-2026-87775 Tz Weekly Radio Schedule <= 1.8.1 - Unauthenticated SQLi via tzwrs_update_cell
CVE-2026-90978 Filter Gallery < 1.1.5 - Subscriber+ Arbitrary Post Overwrite and Plugin Option Deletion v
CVE-2026-90984 Generate PDF using Contact Form 7 < 4.2.2 - Unauthenticated Server-Side Request Forgery vi
CVE-2026-89008 Bookit < 2.6.0.5 - Bookit Staff+ Appointment PII Disclosure
CVE-2026-89007 Bookit < 2.6.0.5 - Bookit Staff+ Arbitrary Appointment Deletion via Missing Authorization
CVE-2026-87966 Easy Appointments 4.0 - 4.0.2.1 - Unauthenticated Arbitrary Appointment Modification and D
CVE-2026-88825 iGMS Direct Booking < 2.0 - Unauthenticated Stored XSS via Widget Settings
CVE-2026-88993 All Bootstrap Blocks <= 1.3.31 - Contributor+ Stored XSS via areoi/button type Attribute
CVE-2026-88844 MasterStudy LMS 3.6.2 - < 3.7.50 - Instructor+ Student PII Disclosure via IDOR
CVE-2026-87770 Price Drop Alert for WooCommerce <= 1.1 - Unauthenticated SQL Injection via product
CVE-2026-81810 All-in-One WP Migration and Backup < 7.111 - Authenticated Privilege Escalation to Admin v
CVE-2026-87771 Product Question and Answer <= 1.1.0 - Unauthenticated SQL Injection via p_id and read
CVE-2026-87774 Tz Weekly Radio Schedule <= 1.8.1 - Unauthenticated SQL Injection via week
CVE-2026-87965 Easy Appointments < 4.0.2.2 - Unauthenticated Appointment Cancellation/Confirmation via Fo

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Really Simple Security
Same vendor: Unknown

V. Comments for CVE-2026-88798

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