# Australia warns of active attacks on TeamCity servers

_Tuesday, August 25, 2026 at 7:00 AM EDT · Security · Latest · Tier 1 — Major_

![Australia warns of active attacks on TeamCity servers — Primary](https://assets.infosecurity-magazine.com/webpage/og/ef84a9c1-799d-4387-90d9-d49b524b1326.jpeg)

Australia's Cyber Security Centre warned that attackers are actively exploiting CVE-2026-63077 in TeamCity On-Premises servers. The critical flaw can let an unauthenticated attacker with HTTP(S) access bypass authentication checks and execute operating-system commands. The article says all TeamCity On-Premises versions are affected and advises customers to review their networks, patch vulnerable installations and assess whether their TeamCity interface needs to be internet-exposed. JetBrains previously issued patches and later reported exploitation targeting unpatched servers.

## Sources

- [Infosecurity Magazine](https://www.infosecurity-magazine.com/news/australia-exploitation-teamcity/)

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Canonical: https://techandbusiness.org/newswire/AD-UYuCxmQmriEiHeQQCAj
Retrieved: 2026-08-25T13:20:05.306Z
Publisher: Tech & Business (techandbusiness.org)