CVE-2026-57298: Jenkins Contrast Plugin CSRF Vulnerability – Remediation Guide

Technical summary

CVE-2026-57298 is a cross-site request forgery (CWE-352) in Jenkins Contrast Continuous Application Security Plugin versions 3.11 and earlier. The vulnerability stems from insufficient CSRF protections on Jenkins endpoints that configure or invoke Contrast plugin functionality. An unauthenticated attacker can craft a malicious webpage or inject code into a trusted site visited by a Jenkins administrator. When the administrator performs an action in Jenkins (such as clicking a link or viewing a page), the browser automatically submits a forged request that changes the Contrast plugin's configuration—specifically, the connection URL, username, API key, and service key—to attacker-controlled values. The plugin then uses these credentials to connect to the attacker's infrastructure, enabling credential harvesting, man-in-the-middle attacks on security scans, or lateral movement into downstream systems that trust Jenkins.

Business impact

Application security workflows depend on accurate, trustworthy vulnerability scanning results. A successful CSRF attack compromises the integrity of Contrast scan reports, potentially allowing defective code to reach production undetected. Additionally, the attacker gains visibility into the organization's API keys and service credentials, creating risk of further compromise. For organizations relying on Jenkins to orchestrate security testing in regulated environments, this vulnerability can introduce audit and compliance gaps. Remediation delays increase the window during which an attacker can intercept or manipulate scan traffic.

Affected systems

Jenkins instances running the Contrast Continuous Application Security Plugin at version 3.11 or earlier are affected. Any Jenkins user with permission to configure jobs or plugins is at risk of being targeted by a CSRF attack, though typically the attack aims to compromise administrators or power users. Organizations deploying Jenkins in air-gapped or restricted networks may have reduced exposure, while those with Jenkins exposed to the internet or integrated into shared CI/CD platforms face higher risk.

Exploitability

The vulnerability requires user interaction (a logged-in administrator must visit an attacker-controlled or compromised page), but the attack is straightforward to execute and does not require specialized exploit code—a simple HTML form or JavaScript snippet embedded in an email, advertisement, or malicious website can trigger it. The attack is blind; the attacker does not see the response, but because the Jenkins server connects outbound to validate credentials, the attacker can detect successful exploitation through callbacks or by monitoring network traffic. No complex social engineering is required beyond convincing an administrator to visit a webpage, making this a practical threat. The CVE is not currently listed on CISA's Known Exploited Vulnerabilities catalog, though that status can change.

Remediation

Upgrade the Contrast Continuous Application Security Plugin to a patched version released after June 24, 2026. Consult the Jenkins plugin repository and Contrast's official security advisories for the specific version number that addresses this vulnerability. Additionally, enforce CSRF protection mechanisms in Jenkins itself (CSRF tokens are typically enabled by default in modern Jenkins instances) and restrict administrative access to Jenkins through network-level controls, VPNs, or IP allowlisting to reduce the attack surface. As a workaround pending patch deployment, consider temporarily disabling the plugin if it is not actively in use.

Patch guidance

Check Jenkins plugin update channels and Contrast's security advisories for patch versions released after CVE-2026-57298 was published (June 24, 2026). The patch should be applied to all Jenkins instances using the Contrast plugin in version 3.11 or earlier. Perform patching in a controlled manner—test the updated plugin in a non-production environment first to ensure compatibility with your Jenkins version and other plugins. After patching, verify that Contrast scanning jobs execute correctly and that credential configurations are preserved or re-entered as needed.

Detection guidance

Monitor Jenkins audit logs and web server access logs for anomalous changes to Contrast plugin configuration, particularly alterations to connection URLs, API keys, or service keys. Look for POST or GET requests to Jenkins plugin configuration pages originating from unexpected sources (e.g., external referrer headers or cross-origin requests). Network-level monitoring can detect outbound connections from Jenkins to unexpected IP addresses or domains if an attacker's CSRF attempt was successful. Additionally, audit Jenkins user sessions and cross-site request patterns; a sudden spike in administrative configuration changes or failed API authentication attempts from the Contrast plugin may indicate an attack in progress.

Why prioritize this

This vulnerability merits medium priority for most organizations. The CVSS score of 5.4 reflects that exploitation requires an authenticated user to be tricked into visiting an attacker-controlled page, limiting the immediate attack surface compared to unauthenticated remote code execution flaws. However, the integrity impact on application security results and the exposure of credentials justify timely remediation. Organizations running Jenkins in high-security or regulated environments, or those where Contrast scanning is mission-critical, should prioritize patching within 30 days. Organizations with robust CSRF protections already enabled in Jenkins can safely defer patching slightly, but should not leave the plugin unpatched indefinitely.

Risk score, explained

The CVSS 3.1 score of 5.4 (MEDIUM) reflects a network-accessible vulnerability (AV:N) requiring low attack complexity (AC:L), authentication (PR:L, the attacker needs the victim to be logged in), and no special user interaction beyond the victim visiting a webpage (UI:N). The impact is limited to confidentiality and integrity (a credential leak and configuration change) with no availability impact (A:N). Severity is not elevated to HIGH because the attack is not unauthenticated and the scope is unchanged (the attacker cannot break out of Jenkins' privilege boundary). Nevertheless, the real-world impact—poisoning of security scan results and credential exposure—argues for treating this as a near-term remediation priority despite the MEDIUM score.

Frequently asked questions