https://www.phllaps.net/tags/jetbrains/ Recent content in JetBrains on PhllapsNET Hugo en-gb Wed, 05 Aug 2026 00:00:00 +0000 https://www.phllaps.net/posts/jetbrains-teamcity-deserialization-of-untrusted-data-vulnerability/ Wed, 05 Aug 2026 00:00:00 +0000 https://www.phllaps.net/posts/jetbrains-teamcity-deserialization-of-untrusted-data-vulnerability/ <div style="background:#b91c1c;color:white;padding:16px 18px;border-radius:14px;font-weight:800;font-size:18px;display:flex;align-items:center;gap:12px;box-shadow:0 10px 24px rgba(0,0,0,0.18);"><span style="font-size:24px;">🚨</span><span>SEVERITY: CRITICAL — CVSS 9.8</span><span style="opacity:0.95;font-weight:700;margin-left:auto;">Security Advisory</span></div> <h2 id="tldr-">TL;DR 📌</h2> <ul> <li>JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.</li> <li>Highest CVSS: <strong>9.8 (Critical)</strong>.</li> <li><strong>Listed in CISA KEV</strong> (2026-08-05) — this is being exploited in the wild.</li> <li><strong>Check the advisory for fixed releases</strong> — remediation detail is in the vendor link below.</li> <li>CVEs: CVE-2026-63077.</li> </ul> <h2 id="what-it-is">What it is</h2> <p>CVE-2026-63077 is a deserialisation of untrusted data vulnerability in JetBrains TeamCity. It sits in the agent polling protocol, which handles communication between TeamCity build agents and the server.</p>