VulnerabilityModified

CVE-2026-53435

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
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-502
Affected: jenkins/jenkins
Source: jenkinsci-cert@googlegroups.com

EPSS trend

EPSS moved from 2.2% on 24 September 2026 to 53.1% on 26 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.