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Jenkins has released fixes in Jenkins 2.568 and Jenkins LTS 2.555.3 for multiple vulnerabilities affecting the automation server, including a high-impact unsafe deserialization flaw tracked as CVE-2026-53435. According to the disclosure, attackers with Overall/Read permission and additional access such as a valid user account or the ability to post config.xml data could trigger deserialization of Jenkins core or plugin types, potentially leading to user impersonation, arbitrary HTTP requests, possible Script Console code execution, and arbitrary file reads from the Jenkins controller. The issues affect Jenkins 2.567 and earlier and Jenkins LTS 2.555.2 and earlier.
The advisory also addresses several additional weaknesses, including open redirect bugs in the login flow, a missing permission check in HTTP endpoints, an unsafe redirect in the "Delegate to servlet container" security realm, a stored XSS issue through offline cause descriptions, and exposure of plaintext secrets through config.xml handling. Organizations running self-managed Jenkins instances should prioritize upgrading to the fixed releases and review controller exposure, user permissions, and configuration handling paths that could allow low-privileged users to reach sensitive functionality.
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2 events from the most recent confirmed update back to the earliest known activity.
Defused reported that its honeypots saw exploitation attempts targeting Jenkins CVE-2026-53435 within hours of the June 10 public disclosure. The activity showed the newly disclosed remote code execution flaw was being exploited in the wild shortly after patches were released.
Jenkins disclosed multiple security vulnerabilities affecting Jenkins 2.567 and earlier and Jenkins LTS 2.555.2 and earlier, and released fixes in Jenkins 2.568 and Jenkins LTS 2.555.3. The advisory identified CVE-2026-53435 as the most severe issue, alongside additional flaws including open redirect, missing permission checks, stored XSS, and plaintext secret exposure.
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Jenkins published a security advisory covering multiple vulnerabilities in widely used plugins, with fixes released for affected versions. The disclosed issues span **missing permission checks**, **unsafe deserialization**, **stored cross-site scripting**, and an **open redirect**, affecting plugins including **Script Security**, **Credentials Binding**, **Matrix Authorization Strategy**, **GitHub Branch Source**, **GitHub**, **HTML Publisher**, and **Microsoft Entra ID**. The most serious issue is an **arbitrary file write** flaw that can lead to **remote code execution**, while other bugs could let attackers abuse low-privilege access such as `Overall/Read`, `Item/Configure`, or the ability to supply credentials to a job. Jenkins said the advisory includes severity ratings, attribution, and patched plugin versions, and urged administrators to update impacted plugins to the fixed releases.
Jun 29, 2026
Jenkins, a widely used open-source automation server, has released critical security updates to address multiple high-severity vulnerabilities that could expose CI/CD pipelines to significant risks. The most severe flaw, tracked as CVE-2025-67635, affects Jenkins versions 2.540 and earlier (including LTS 2.528.2 and earlier) and allows unauthenticated attackers to trigger denial-of-service (DoS) attacks via the HTTP-based command-line interface. This vulnerability arises from improper connection handling, where corrupted HTTP CLI streams are not properly closed, enabling attackers to exhaust server resources and render Jenkins instances unresponsive. Organizations relying on Jenkins are urged to upgrade to version 2.541 or LTS 2.528.3 to mitigate this risk. In addition to the DoS vulnerability, another high-severity issue, CVE-2025-67641, was identified in the Jenkins Coverage Plugin. This flaw allows attackers with "Item/Configure" permissions to exploit coverage reports for stored cross-site scripting (XSS) attacks by submitting malicious JavaScript via the REST API. If an administrator views a compromised report, the script executes, potentially leading to session hijacking. Both vulnerabilities have been addressed in the latest Jenkins security updates, and immediate patching is recommended to protect against exploitation.
Jun 29, 2026
Jenkins released security updates for multiple plugins, including **Active Directory**, **LDAP**, **AppSpider**, **Bitbucket OAuth**, **Credentials Binding**, **Email Extension**, **GitHub Integration**, **Job Import**, **Multijob**, and **Pipeline: Groovy Libraries**. The most severe issues affect the **LDAP** and **Active Directory** plugins, which could follow LDAP referrals to attacker-controlled RMI URLs and trigger deserialization on the Jenkins controller, creating a potential path to remote code execution under certain conditions. The advisory also addressed a range of additional plugin vulnerabilities, including arbitrary file read, arbitrary file write that could enable code execution, phishing through an open redirect, CSRF-triggered actions, credential ID enumeration, and SSRF-like outbound connections. Jenkins separately disclosed a **stored XSS** flaw in the `buildgraph-view` plugin that remained unresolved at publication time, leaving users without an available fix for that issue.
Jun 29, 2026