TI-2026-81992 Aliases CVE-2026-115968 GHSA-cw69-4j8j-28wc

PHP object injection in WordPress Ultimate Member plugin

MEDIUM 49CWE-502Published 2026-10-28 · Updated 2026-10-28

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

The Ultimate Member plugin for WordPress, from n/a through 2.13.1, deserializes untrusted data, which allows PHP object injection (CWE-502). An unauthenticated remote attacker can trigger it with low complexity and no user interaction, with high impact on confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Deserialization of Untrusted Data vulnerability in Ultimate Member Ultimate Member ultimate-member allows Object Injection.This issue affects Ultimate Member: from n/a through 2.13.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00408 35th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

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
ultimatemember	Ultimate Member	up to 2.13.1	—	No fix listed	CNA

Ultimate Member Vendorultimatemember Affected up to 2.13.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Ultimate Member.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

2026-10-28 Threatist record created from CVE-2026-115968
2026-10-28 Alias added: GHSA-cw69-4j8j-28wc
2026-10-28 CISA SSVC decision points changed

References

Other 1

https://patchstack.com/database/wordpress/plugin/ultimate-member/vulnerability/wordpress-ultimate-member-plugin-2-13-1-php-object-injection-vulnerability?_s_id=cve

TI-2024-00992 SQL injection in ultimatemember Ultimate Member – User Profile, Registration, Login… CVSS 3.1CRITICAL 9.8
TI-2023-03232 Ultimate Member < 2.6.7 - Unauthenticated Privilege Escalation CVSS 3.1CRITICAL 9.8
TI-2022-03726 JobBoardWP < 1.2.2 - Unauthenticated Arbitrary File Upload CVSS 3.1HIGH 7.5
TI-2020-19304 WordPress Plugin ultimate-member 2.1.3 Local File Inclusion CVSS 4.0MEDIUM 6.8
TI-2024-01973 Ultimate Member <= 2.8.3 - Unauthenticated Stored Cross-Site Scripting CVSS 3.1HIGH 7.2
TI-2020-18475 An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka… CVSS 3.1CRITICAL 10.0

See all 76 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences