Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofed Client IP Header
Priority LOW 30CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-400.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0042 36th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Really Simple Security (Unknown): 9.8.3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Really Simple Security | 8.1.6 to before 9.8.3 | 9.8.3 | Patch available | CNA |
- Really Simple Security VendorUnknown Affected 8.1.6 to before 9.8.3 Fixed in 9.8.3 Patch available CNA
Remediation
- Fix · CNA Really Simple Security (Unknown) Fixed in 9.8.3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-88798
- 2026-10-03 Alias added: GHSA-43h4-q789-j3pr
References
Sources
- CVE-2026-88798 · CVE Program
- CVE-2026-88798 · NVD
- FIRST EPSS
- GHSA-43h4-q789-j3pr · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences