Ultimate Member: PHP object injection
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. The CNA vector indicates that no prior authentication is required. The export does not disclose the endpoint, input parameter, vulnerable function or detailed input-processing path. No additional exploit mechanics are inferred. Untrusted deserialization may create PHP objects; code execution requires a usable gadget chain and its prerequisites, neither of which is established by this record. The structured affected range is <= 2.13.1.
- Component
- Ultimate Member
- Plugin slug
ultimate-member- Affected
- <= 2.13.1
- Safe version
2.14.0- Published
- Oct 28, 2026
This CVE was published Oct 28, 2026 and is one of 68 known issues for this plugin.
Update, patch or deactivate.
Update to a supported release containing the confirmed fix: 2.14.0. Do not deserialize attacker-controlled input into PHP objects; enforce the intended authorization before processing it.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H