What is CVE-2026-84646?

CVE-2026-84646 is a medium-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 4.3/10. Published 2026-09-02.

How severe is CVE-2026-84646?

Medium severity. CVSS v3 base score is 4.3 out of 10.

CVE-2026-84646

CVE-2026-84646

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, user objects can appear as nested field values in other deserialized XML objects, allowing attackers with Overall/Read permission to create user objects by submitting crafted XML.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

jenkinsci-cert@googlegroups.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-84646?: CVE-2026-84646 is a medium-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 4.3/10. Published 2026-09-02.
How severe is CVE-2026-84646?: Medium severity. CVSS v3 base score is 4.3 out of 10.