CVE-2026-53435
Last modified
CVE-2026-53435 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 14.91% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Jenkins | Jenkins | < 2.555.3 |
| Jenkins | Jenkins | < 2.568 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-53435?
How severe is CVE-2026-53435?
How do I fix CVE-2026-53435?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-5343Improper Check for Unusual or Exceptional Conditions vulnera…7.4
- CVE-2026-53430Improper Handling of Highly Compressed Data (Data Amplificat…8.7
- CVE-2026-53431Authentication Bypass by Capture-replay vulnerability in mal…9.1
- CVE-2026-53432fzf is vulnerable to Integer Overflow leading to crash in Fu…7.5
- CVE-2026-53433fzf is vulnerable to a Denial of Service (DoS) due to ineffi…7.5
- CVE-2026-53434Detection of Error Condition Without Action vulnerability in…9.1
- CVE-2026-53436Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperl…4.3
- CVE-2026-53437Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperl…4.3
- CVE-2026-53438A missing permission check in Jenkins 2.567 and earlier, LTS…4.3
- CVE-2026-53439Missing permission checks in Jenkins 2.567 and earlier, LTS …4.3
- CVE-2026-5344A security vulnerability has been detected in Textpattern up…6.3
- CVE-2026-53440Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not …4.3
Are you affected by CVE-2026-53435?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST