SB2026081791 - Multiple vulnerabilities in YouTrack

Description

This security bulletin contains information about 3 vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2026-49368)

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:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

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

The vulnerability exists due to cross-site scripting in project notification templates when rendering stored template content. A remote user can inject a malicious script into a notification template to execute arbitrary script code in a victim's browser.

2) Incorrect authorization (CVE-ID: CVE-2026-49369)

CWE-ID: CWE-863 - Incorrect 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 sensitive information.

The vulnerability exists due to improper access control in Users and Groups pages when handling requests. A remote user can access Users and Groups pages to disclose sensitive information.

3) Insertion of Sensitive Information Into Sent Data (CVE-ID: CVE-2026-49370)

CWE-ID: CWE-201 - Insertion of Sensitive Information Into Sent Data

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

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper access control in fetchApp requests when handling requests. A remote attacker can send a crafted request to disclose sensitive information.

Remediation

Install update from vendor's website.

References

• https://www.jetbrains.com/privacy-security/issues-fixed/#02d36e3c7a3187ebc0d5eb4648cd73c2
• https://www.jetbrains.com/privacy-security/issues-fixed/#085177ed7e4b3b4e30ab797be39065f4
• https://www.jetbrains.com/privacy-security/issues-fixed/#0f50dbe41f528a1b0c3782ce89667aad