SB2026100228 - Multiple vulnerabilities in YouTrack

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Main Vulnerability Database SB2026100228

SB2026100228 - Multiple vulnerabilities in YouTrack

Published: October 2, 2026

Security Bulletin ID SB2026100228
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 14
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 29% Low 71%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 14 vulnerabilities.


1) Incorrect authorization (CVE-ID: CVE-2026-100270)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote user to disclose integration credentials.

The vulnerability exists due to incorrect authorization in import configurations when accessing import configurations. A remote user can access import configurations to disclose integration credentials.


2) Inefficient regular expression complexity (CVE-ID: CVE-2026-100267)

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

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


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient regular expression complexity in mailbox regex mail-rule filters when processing mailbox regex mail-rule filters. A remote attacker can submit a crafted mailbox regex mail-rule filter to cause a denial of service.


3) Authorization bypass through user-controlled key (CVE-ID: CVE-2026-100268)

CWE-ID: CWE-639 - Authorization Bypass Through User-Controlled Key

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 comments from other projects.

The vulnerability exists due to authorization bypass through a user-controlled key in notification templates when processing notifications. A remote user can use notification templates to access comments associated with other projects.


4) Missing Authorization (CVE-ID: CVE-2026-100269)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to access Helpdesk project reporting functionality without authorization.

The vulnerability exists due to missing authorization in the Helpdesk project's Authorized Reporters list when enforcing reporter restrictions. A remote user can bypass the Authorized Reporters list to access Helpdesk project reporting functionality without authorization.


5) Missing Authorization (CVE-ID: CVE-2026-100271)

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 information from other projects.

The vulnerability exists due to missing authorization in several endpoints when handling authenticated requests. A remote user can access information from other projects to disclose information from other projects.


6) Authorization bypass through user-controlled key (CVE-ID: CVE-2026-100272)

CWE-ID: CWE-639 - Authorization Bypass Through User-Controlled Key

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


The vulnerability allows a remote user to read restricted issues.

The vulnerability exists due to missing authorization in the notification template preview when previewing notification templates. A remote user can preview a notification template to read restricted issues.


7) Incorrect authorization (CVE-ID: CVE-2026-100273)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to improper authorization in the scripts debugger when accessing debugger functionality. A remote user can bypass authorization controls in the scripts debugger to execute arbitrary code.


8) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-100274)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

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


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to allocation of resources without limits in notification templates when processing a notification template. A remote privileged user can trigger processing of a notification template to cause a denial of service.


9) Cross-site scripting (CVE-ID: CVE-2026-100275)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]


The vulnerability allows a remote attacker to execute arbitrary script in a victim's browser.

The vulnerability exists due to improper neutralization of script content in the workflow error notification toast when rendering stored workflow error notifications. A remote attacker can store malicious script content in a workflow error notification to execute arbitrary script in a victim's browser.

Exploitation requires a user to view the workflow error notification toast.


10) Incorrect authorization (CVE-ID: CVE-2026-100276)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote user to perform restricted workflow actions.

The vulnerability exists due to improper authorization in workflow action visibility restrictions when removing a workflow action's visibility restriction. A remote user can remove the visibility restriction and run the action to perform restricted workflow actions.


11) Incorrect authorization (CVE-ID: CVE-2026-100277)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to take over accounts.

The vulnerability exists due to improper authorization in notification signature handling when processing a replayed notification signature. A remote attacker can replay a notification signature to take over accounts.


12) Incorrect authorization (CVE-ID: CVE-2026-100278)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote user to modify or hide other users' comments.

The vulnerability exists due to incorrect authorization in comment management when editing or hiding comments belonging to other users. A remote user can exploit insufficient permission checks to modify or hide other users' comments.


13) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2026-100279)

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

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


The vulnerability allows a remote user to disclose stored credentials.

The vulnerability exists due to server-side request forgery in integration URL handling when changing an integration URL. A remote user can change an integration URL to disclose stored credentials.


14) Missing Authorization (CVE-ID: CVE-2026-100280)

CWE-ID: CWE-862 - Missing Authorization

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


The vulnerability allows a remote user to create a project from an unreadable custom template.

The vulnerability exists due to missing authorization in custom project template handling when creating a project from a custom template. A remote user can select an unreadable custom template to create a project from it.


Remediation

Install update from vendor's website.

References