SB2026051259 - Multiple vulnerabilities in TeamCity

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Main Vulnerability Database SB2026051259

SB2026051259 - Multiple vulnerabilities in TeamCity

Published: May 12, 2026 Updated: August 17, 2026

Security Bulletin ID SB2026051259
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 8
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 38% Low 63%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 8 vulnerabilities.


1) Missing Authentication for Critical Function (CVE-ID: CVE-2026-44413)

CWE-ID: CWE-306 - Missing Authentication for Critical Function

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to expose server API to unauthorized access.

The vulnerability exists due to missing authentication for a critical function in the server API when handling requests from authenticated users. A remote user can access the exposed API to expose server API to unauthorized access.


2) Improper Neutralization of Argument Delimiters in a Command (CVE-ID: CVE-2026-49373)

CWE-ID: CWE-88 - Argument Injection or Modification

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 argument injection in Perforce connection settings when processing user-supplied connection parameters. A remote user can supply specially crafted Perforce connection settings to execute arbitrary code.


3) Missing Authorization (CVE-ID: CVE-2026-49374)

CWE-ID: CWE-862 - Missing 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 sensitive information.

The vulnerability exists due to improper access control in build configuration parameters when handling permission checks. A remote user can access exposed build configuration parameters to disclose sensitive information.


4) Missing Authorization (CVE-ID: CVE-2026-49378)

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 sensitive information.

The vulnerability exists due to improper authorization in parameter autocompletion when handling autocomplete requests for credential parameters. A remote user can query parameter autocompletion to disclose sensitive information.


5) Insufficiently protected credentials (CVE-ID: CVE-2026-49379)

CWE-ID: CWE-522 - Insufficiently Protected Credentials

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 exposure of sensitive information in thread names in TeamCity when handling credentials. A remote user can access thread names containing credentials to disclose sensitive information.


6) Open redirect (CVE-ID: CVE-2026-49380)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to redirect users to an arbitrary website.

The vulnerability exists due to an open redirect in the SAML plugin when handling redirect requests. A remote user can craft a malicious link to redirect users to an arbitrary website.


7) Cross-site scripting (CVE-ID: CVE-2026-49381)

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 user's browser.

The vulnerability exists due to cross-site scripting in the SAML login page when rendering stored user-supplied content. A remote attacker can inject a malicious script payload to execute arbitrary script in a user's browser.


8) Incorrect authorization (CVE-ID: CVE-2026-49376)

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:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to bypass authorization checks.

The vulnerability exists due to improper access control in the SAML plugin when validating usernames. A remote user can use a specially crafted username to bypass authorization checks.


Remediation

Install update from vendor's website.

References