PatchTheCVECVE-2026-84646: In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, user objects can appear as nested field values in other
CVE-2026-84646 is a medium-severity flaw (CVSS 4.3) affecting jenkins. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 73%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2026-09-02 |
| Last modified | 2026-09-11 |
Last updated 2026-09-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-84646?
jenkins: upgrade to 2.568.3, 2.580. Exact commands for each OS are on this page.
Is CVE-2026-84646 being exploited?
CVE-2026-84646 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-84646 affect?
CVE-2026-84646 affects jenkins. Severity is medium (CVSS 4.3). 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.
How urgent is CVE-2026-84646?
Priority 22/100. No elevated risk signals yet.
Software pages
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