CVE-2025-54528: CSRF Vulnerability in JetBrains TeamCity GitHub App Connection
This blog post details a Cross-Site Request Forgery (CSRF) vulnerability, identified as CVE-2025-54528, affecting JetBrains TeamCity. This flaw could allow an attacker to perform unauthorized actions on behalf of a user interacting with the GitHub App connection flow.
Vulnerability Details
- CVE ID: CVE-2025-54528
- Description: A CSRF vulnerability exists in JetBrains TeamCity before version 2025.07 within the GitHub App connection flow. This allows an attacker to potentially trick a user into performing actions they did not intend to.
- CVSS Score: 5.4 (Medium)
- CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CVSS Explanation: This vulnerability has a medium severity because it requires user interaction (clicking a malicious link) and can lead to limited confidentiality and integrity impact. An attacker can't directly access data but can potentially alter some settings or perform actions.
- Exploit Requirements: An attacker would need to craft a malicious link or embed a form on a website that targets a logged-in TeamCity user. The user must then click the link or interact with the form while authenticated to TeamCity.
- Affected Vendor: JetBrains
- Affected Product: TeamCity
- Affected Version: Versions prior to 2025.07
- CWE: CWE-352 - Cross-Site Request Forgery (CSRF)
- CWE Explanation: CSRF occurs when a malicious website, email, blog, instant message, or program causes a user's web browser to perform an unwanted action on a trusted site when the user is authenticated. The target website trusts the browser because the user is already logged in.
Timeline of Events
- Discovered: Likely reported before the CVE publication date.
- Published: 2025-07-28
- Fixed: Addressed in TeamCity version 2025.07
Exploitability & Real-World Risk
The exploitability of this vulnerability depends on the attacker's ability to craft convincing phishing emails or malicious websites. While the impact is limited, a successful CSRF attack could lead to unintended configuration changes within the TeamCity project related to the GitHub App integration. This could potentially be chained with other vulnerabilities for more severe impact. Imagine an attacker could modify build configurations.
Recommendations
- Upgrade: Upgrade to JetBrains TeamCity version 2025.07 or later.
- User Awareness: Educate users about the risks of clicking suspicious links or interacting with untrusted websites.
- CSRF Protection: Ensure your TeamCity instance has robust CSRF protection enabled, if configurable (likely already implemented in newer versions).
Technical Insight
This CSRF vulnerability likely stems from a missing or improperly implemented CSRF token in the GitHub App connection flow. Without proper validation, an attacker can forge requests that appear to originate from a legitimate user's session, leading to unauthorized actions being executed.
Credit to Researcher(s)
This information is based on the public CVE and JetBrains security advisories. Specific researcher attribution may be available in the linked resources.
References
Tags
CVE-2025-54528, JetBrains, TeamCity, CSRF, GitHub App, Security Vulnerability
Summary: CVE-2025-54528 is a medium severity CSRF vulnerability in JetBrains TeamCity before 2025.07. It allows attackers to perform unauthorized actions through a crafted request targeting a logged-in user interacting with the GitHub App connection flow.
CVE ID: CVE-2025-54528
Risk Analysis: A successful CSRF attack can lead to unauthorized changes to the TeamCity configuration related to the GitHub App integration. This can potentially disrupt build processes or allow an attacker to inject malicious code into the build pipeline.
Recommendation: Upgrade to JetBrains TeamCity version 2025.07 or later to patch the vulnerability. Educate users on identifying and avoiding suspicious links.
Timeline
- 2025-07-28: CVE-2025-54528 published