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Attackers Breached JetBrains Cadence via Unpatched TeamCity, Extracting AWS Credentials
Unknown attackers exploited critical TeamCity flaw CVE-2026-63077 to breach JetBrains Cadence, stealing a 2024 backup, user data, and AWS credentials; rotation urged.
JetBrains disclosed that threat actors exploited CVE-2026-63077 (CVSS 9.8), a TeamCity deserialization vulnerability added to CISA's KEV catalog on August 5, 2026, to breach its Cadence cloud computing service, with the intrusion running August 8-24, 2026. Confirmed access includes personal data (usernames, names, emails, login timestamps, IPs), a full 2024 Cadence server backup containing credentials and configuration, multiple AWS IAM users and secrets, files in JetBrains S3 buckets, and possibly PyCharm-synchronized source code. The compromised api.cadence.jetbrains.com server has been taken offline and all Cadence plugin access tokens invalidated. JetBrains urges users to immediately revoke or rotate all credentials used with Cadence and treat all executions, inputs, and outputs as potentially untrusted.
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U.S. CISA adds Cisco Catalyst, Kentico Xperience, PaperCut NG/MF, Synacor ZCS, Quest KACE SMA, and JetBrains TeamCity flaws to its Known Exploited Vulnerabilities catalog
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JetBrains security advisory (AV26-891)
Canada's Cyber Centre relayed a JetBrains advisory covering vulnerabilities in GoLand, Hub, IntelliJ IDEA and YouTrack.
Advisory AV26-891, dated September 8, 2026, notes JetBrains vulnerabilities affecting GoLand prior to 2026.2.2.1, Hub prior to 2026.2.52442, IntelliJ IDEA prior to 2026.2.2, and multiple YouTrack versions. Users and administrators are encouraged to review JetBrains' advisory and apply any necessary updates. No specific CVEs or exploitation details are provided in the relayed advisory.
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