CVE-2026-123331 in YouTrack
Summary
by MITRE • 11/06/2026
In JetBrains YouTrack before 2026.2.19197 article editors could change visibility of restricted child articles
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Analysis
by VulDB Data Team • 11/06/2026
The vulnerability identified in JetBrains YouTrack prior to version 2026.2.19197 represents a critical authorization flaw within the application's content management subsystem, specifically affecting the hierarchical structure of project documentation and issue tracking records. This security defect allows authenticated users who possess standard editing permissions for parent articles or issues to inadvertently or maliciously alter the visibility settings of restricted child items that they should not have access to view or modify. In a typical enterprise deployment of YouTrack, information is often organized in nested structures where sensitive data such as confidential project roadmaps, security audit findings, or proprietary business logic are stored within parent containers but require strict access controls on individual leaf nodes to prevent unauthorized disclosure. The flaw arises from an insufficient verification mechanism during the update operation for child article visibility attributes, failing to properly validate whether the initiating user holds explicit permissions for those specific restricted sub-items before applying the change.
From a technical perspective, this vulnerability is classified under CWE-269, which denotes Improper Control of Interaction with Unprivileged Components, and more specifically aligns with CWE-862, Missing Authorization, as the application fails to enforce access control policies on sensitive resources. The operational impact of this flaw extends beyond simple data leakage; it undermines the integrity of the organization's information governance framework by allowing lower-level contributors to expose high-sensitivity content to broader audiences within the system. An attacker with a basic editor role could escalate their effective privileges by modifying visibility flags, thereby bypassing intended restrictions and potentially exposing confidential intellectual property or internal operational details to users who lack clearance for such data. This behavior also facilitates potential information disclosure attacks where sensitive metadata or contextual clues embedded in previously hidden articles become accessible through indirect means once the visibility is altered.
The exploitation of this vulnerability does not require complex technical payloads but rather relies on social engineering or simple interface manipulation, making it particularly dangerous in environments with high user turnover or insufficient security awareness training. Attackers can leverage standard web interfaces or API endpoints to send modified requests that change the public status of restricted child articles, effectively turning private data into publicly accessible content within the YouTrack instance. This compromises confidentiality and trust among team members who rely on accurate access controls for collaborative work. Furthermore, if these articles contain links to external resources or embedded credentials, the exposure could lead to secondary security incidents including phishing campaigns or credential theft by external actors gaining visibility into internal communications.
Mitigation strategies must prioritize immediate software updates as the primary defense vector. Organizations running versions of YouTrack earlier than 2026.2.19197 should upgrade to the latest patched release provided by JetBrains, which includes corrected authorization checks that properly validate user permissions against each individual child item before allowing visibility modifications. In addition to patching, administrators should review existing role-based access control policies to ensure that editing rights for parent containers do not implicitly grant excessive privileges over nested restricted content. Implementing regular audits of article visibility settings and monitoring logs for unusual patterns in permission changes can help detect potential abuse early. Security teams are also advised to enforce the principle of least privilege by restricting editor roles to only those projects or articles where explicit access is required, thereby reducing the attack surface available to malicious insiders or compromised accounts.