U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds a JetBrains TeamCity vulnerability to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a JetBrains TeamCity vulnerability, tracked as CVE-2026-63077 (CVSS score of 9.8), to its Known Exploited Vulnerabilities (KEV) catalog. At the end of July, JetBrains released security updates for TeamCity […]

A newly patched security flaw impacting on-premise versions of JetBrains TeamCity has come under active exploitation in the wild, according to the U.S. Cybersecurity and Infrastructure Security Agency (CISA). The vulnerability in question is CVE-2026-63077 (CVSS score: 9.8), a case of deserialization of untrusted data that could allow an unauthenticated attacker with access to a TeamCity server

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.   CVE-2026-63077 JetBrains TeamCity Deserialization of Untrusted Data Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential add...

JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.

JetBrains has patched CVE-2026-63077, a critical TeamCity flaw that could let unauthenticated attackers execute server commands and compromise connected CI/CD pipelines. The post Critical TeamCity Flaw Could Let Unauthenticated Attackers Execute Server Commands appeared first on TechRepublic .

JetBrains has fixed a critical vulnerability (CVE-2026-63077) affecting TeamCity On-Premises and is urging admins to upgrade self-hosted servers as soon as possible. “For those who are unable to do so, we have released a security patch plugin,” noted Daniel Gallo, Solutions Engineering Lead at JetBrains. TeamCity as a possible target JetBrains TeamCity is a widely used continuous integration and continuous delivery (CI/CD) server solution. It’s available as a JetBrains-hosted option (TeamCity Cloud) or can be … More → The post JetBrains fixes critical unauthenticated RCE in TeamCity On-Premises (CVE-2026-63077) appeared first on Help Net Security .