{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/teamcity-on-premises/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["TeamCity On-Premises"],"_cs_severities":["medium"],"_cs_tags":["privilege-escalation","teamcity","webserver"],"_cs_type":"advisory","_cs_vendors":["JetBrains"],"content_html":"\u003cp\u003eA vulnerability exists in JetBrains TeamCity On-Premises that allows a remote, authenticated attacker to escalate their privileges within the application. The specific nature of the vulnerability is not detailed, but its exploitation could lead to unauthorized access to sensitive data, modification of system configurations, or execution of arbitrary code within the TeamCity environment. This issue affects on-premises installations, potentially impacting organizations that rely on TeamCity for their continuous integration and continuous delivery (CI/CD) processes. Defenders should investigate their TeamCity deployment for unusual account activity and apply the appropriate patches from JetBrains when available.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains initial access to a TeamCity On-Premises instance through legitimate credentials (e.g., compromised account, insider threat).\u003c/li\u003e\n\u003cli\u003eThe attacker identifies a privilege escalation vulnerability within the TeamCity application.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a specific HTTP request to the TeamCity server, exploiting the vulnerability. This request might involve manipulating parameters, exploiting API endpoints, or injecting malicious code.\u003c/li\u003e\n\u003cli\u003eThe TeamCity server processes the malicious request without proper authorization checks.\u003c/li\u003e\n\u003cli\u003eThe attacker successfully escalates their privileges, gaining access to administrative functions or higher-level permissions.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the elevated privileges to access sensitive information, such as build configurations, secrets, or source code.\u003c/li\u003e\n\u003cli\u003eThe attacker modifies build configurations to inject malicious code into software builds, compromising the software supply chain.\u003c/li\u003e\n\u003cli\u003eThe attacker exfiltrates sensitive data or uses the compromised system as a pivot point for further attacks within the network.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability could allow an attacker to gain complete control over the TeamCity instance, leading to unauthorized access to sensitive data, modification of build processes, and potential compromise of the entire software supply chain. The number of affected organizations is unknown, but the impact could be significant for those relying on TeamCity for their CI/CD pipeline. This can lead to data breaches, code injection attacks, and disruption of software development processes.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor TeamCity logs (category: webserver) for suspicious HTTP requests targeting TeamCity endpoints to detect potential exploitation attempts.\u003c/li\u003e\n\u003cli\u003eImplement the Sigma rule to detect common privilege escalation attempts via web requests.\u003c/li\u003e\n\u003cli\u003eApply any available patches or updates released by JetBrains for TeamCity On-Premises to address the vulnerability.\u003c/li\u003e\n\u003cli\u003eReview and enforce strong authentication and authorization policies for TeamCity users to mitigate the risk of compromised accounts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-12T09:55:04Z","date_published":"2026-05-12T09:55:04Z","id":"https://feed.craftedsignal.io/briefs/2026-05-jetbrains-teamcity-privesc/","summary":"A remote, authenticated attacker can exploit a vulnerability in JetBrains TeamCity On-Premises to escalate privileges.","title":"JetBrains TeamCity On-Premises Privilege Escalation Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-05-jetbrains-teamcity-privesc/"}],"language":"en","title":"CraftedSignal Threat Feed — TeamCity On-Premises","version":"https://jsonfeed.org/version/1.1"}