Participants Database: Unsafe object deserialization

An unauthenticated attacker can supply untrusted serialized input that is converted into application objects. The export identifies object injection but does not disclose the deserialization function, input format or a usable gadget chain; code execution is not independently established by this sparse record. The endpoint, action and parameter are not disclosed. The CNA vector records high confidentiality impact, high integrity impact, high availability impact. Affected versions: at most 2.7.8.5.

CVE / CNA score 9.8 CVSS 3.1 · audit@patchstack.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Participants Database
Plugin slug: participants-database
Affected: <= 2.7.8.5
Safe version: See mitigation notes
Published: Oct 23, 2026
Weakness: CWE-502 — Deserialization of Untrusted Data

This CVE was published Oct 23, 2026 and is one of 16 known issues for this plugin.

What to do

Update, patch or deactivate.

This archive could not verify a fixed version because current official author release notes could not be retrieved or located. This archive's uncertainty does not establish that the vendor has not fixed the issue. Restrict or disable the affected feature where warranted and consult the author. Official notes: https://wordpress.org/plugins/participants-database/#developers. Avoid deserializing client-controlled objects; use a data-only format and an allowlist of accepted types. Remove unsafe object construction at the affected trust boundary.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

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.

Source record

Technical description

Deserialization of Untrusted Data vulnerability in xnau webdesign Participants Database participants-database allows Object Injection.This issue affects Participants Database: from n/a through 2.7.8.5.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Primary and upstream sources

Data attribution: This product uses the NVD API but is not endorsed or certified by the NVD.

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