LIVE · cybersecurity feed
Live wire
ASOS Breach Reveals the Risks in Customer-Facing SaaSUnpatched AhsayCBS flaws exploited to deploy webshells, mine cryptoAI Training Critical as Governance Challenges GrowUS Disrupts Chinese State-Sponsored Hacking ToolsCitrix warns admins to patch new NetScaler RCE flaw immediatelyCisco Patches a Dozen Critical VulnerabilitiesCisco warns of critical flaws allowing Nexus switch takeoverCVE-2026-21589 · Exploitation attempts against critical Atlassian flaw have begun (CVE-2026-21589)Cyber experts call on CISA to create mandatory federal OT rulesGremlin Foresight AI finds system weaknesses and verifies the fixes
cve recordcriticalexploited in the wild3 of 3 cataloguesransomwareexploit reported

CVE-2026-63077

JetBrains · TeamCity · JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

Published · Added to CISA KEV
CVSS9.8
Severitycritical
WeaknessCWE-502
EPSS89.6%99.8th percentile
Exploited3 KEV sources
Ransomware useKnown
Federal fix dueAug 8, 2026

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

patch window

Called exploited 9 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listing9d
  3. Last sighting19d

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by0 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

3 public reports collected from VulnCheck and CIRCL, first on Aug 5, 2026. Each links to its original source. We have not verified them.

Description

In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol

Required action (CISA)

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

← Back to the CVE Tracker

Our coverage of CVE-2026-63077

CVE-2025-66516high

Metasploit Wrap Up: This One Goes to Sixteen!

A recent update to the Metasploit framework has introduced sixteen new modules, including ten exploit modules, five of which address vulnerabilities listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. The new exploits target products from Cisco, PaperCut, SonicWall, JetBrains, and Langflow, among others.

CVE-2026-63077critical

Rapid7 Analysis: Unauthenticated Remote Code Execution in JetBrains TeamCity (CVE-2026-63077)

On July 27, 2026, JetBrains issued a security advisory for CVE-2026-63077, a critical unsafe deserialization vulnerability affecting its TeamCity product. This flaw allows an unauthenticated attacker to achieve remote code execution by exploiting the agent polling protocol. An attacker capable of reaching a TeamCity server via HTTP or HTTPS can execute operating system commands with the…

CVE-2026-63077critical

Hackers Start Exploiting Recent JetBrains TeamCity Vulnerability

Reports indicate that threat actors have begun actively exploiting a recently disclosed critical vulnerability in JetBrains TeamCity. The flaw, identified as CVE-2026-63077, allows for unauthenticated remote code execution, posing a significant risk to affected systems.