SB2026081796 - Multiple vulnerabilities in YouTrack

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Main Vulnerability Database SB2026081796

SB2026081796 - Multiple vulnerabilities in YouTrack

Published: August 17, 2026

Security Bulletin ID SB2026081796
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 17% Low 83%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 vulnerabilities.


1) Missing Authorization (CVE-ID: CVE-2026-57921)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to disclose private user data.

The vulnerability exists due to improper access control in the comment templates endpoint when handling requests. A remote user can send a crafted request to disclose private user data.


2) Missing Authorization (CVE-ID: CVE-2026-57922)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to disclose project settings information.

The vulnerability exists due to improper authorization in the MCP when handling requests for project settings. A remote user can request project settings via the MCP to disclose project settings information.


3) Missing Authorization (CVE-ID: CVE-2026-57923)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to modify project settings.

The vulnerability exists due to improper access control in the app configurations endpoint when handling requests to modify configuration data. A remote user can send a crafted request to modify project settings.


4) Incorrect default permissions (CVE-ID: CVE-2026-57924)

CWE-ID: CWE-276 - Incorrect Default Permissions

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to incorrect default permissions in default role configuration when accessing user profile data. A remote user can view excessive user profile details to disclose sensitive information.


5) Missing Authorization (CVE-ID: CVE-2026-57925)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to disclose saved queries and tags.

The vulnerability exists due to improper access control in saved queries and tags when handling access to these objects. A remote user can access saved queries and tags without proper authorization to disclose saved queries and tags.


6) Prototype pollution (CVE-ID: CVE-2026-57926)

CWE-ID: CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes (\'Prototype Pollution\')

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to tamper with application behavior.

The vulnerability exists due to prototype pollution in the websandbox bridge when processing crafted input. A remote attacker can supply crafted properties to modify object prototypes and tamper with application behavior.


Remediation

Install update from vendor's website.

References