SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2026-53435

In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them to handle…

HIGH 8.8EPSS 53.1%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 53.1%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

Description

In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them to handle HTTP requests afterwards. This can be used to impersonate any user and send HTTP requests on their behalf, up to and including use of the Script Console to run arbitrary code, or to read arbitrary files from the Jenkins controller.

CVSS 3.1
8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
53.13% probability · 99th percentile
CISA KEV
Not listed
Weakness
CWE-502
Affected
jenkins/jenkins
Source
jenkinsci-cert@googlegroups.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.