MeridianMeridian

JetBrains TeamCity CVE-2026-63077 Actively Exploited in the Wild, JPCERT Urges Immediate Patching and Breach Investigation

A critical deserialization vulnerability tracked as CVE-2026-63077 has been discovered in JetBrains TeamCity, allowing unauthenticated remote code execution through the agent polling protocol. The flaw was privately reported to JetBrains on July 10, 2026, and publicly disclosed on July 27 with patches released in TeamCity 2026.1.3 and 2025.11.7. Following disclosure, active exploitation was confirmed, prompting CISA to add the vulnerability to its Known Exploited Vulnerabilities Catalog on August 5 and mandate federal agencies to remediate by August 8. JetBrains issued its own exploitation warning on August 7. JPCERT/CC has verified that affected versions remain in use within Japan and notes that public exploit code is now available, recommending organizations verify their deployments, apply updates promptly, and conduct compromise assessments.

Security NEXTTranslated from Japanese

Read at source

JetBrains has released security updates for its continuous integration product TeamCity after a critical vulnerability CVE-2026-63077 was found to be actively exploited in the wild.

The issue stems from unsafe deserialization of untrusted data via the agent polling protocol, enabling remote attackers to execute arbitrary code without authentication. JetBrains received the private report on July 10, 2026, and disclosed the flaw on July 27, shipping fixes in TeamCity 2026.1.3 and 2025.11.7.

Exploitation activity was subsequently observed, leading the U.S. Cybersecurity and Infrastructure Security Agency (CISA) to add the vulnerability to its Known Exploited Vulnerabilities Catalog on August 5 and require federal agencies to apply mitigations by August 8. JetBrains issued its own exploitation advisory on August 7.

The JPCERT Coordination Center confirmed that vulnerable versions of the on-premises TeamCity product are running in Japan. Public exploit code for the remote code execution flaw is now available, increasing the risk of further attacks.

JPCERT/CC strongly recommends that organizations immediately identify their deployed versions, apply the available patches without delay, and consider conducting forensic investigations for signs of compromise.

CISAJetBrainsTeamCityCVE-2026-63077JPCERT
ShareXFacebookLinkedInReddit
Meridian digestThe week's most consequential security stories, distilled into one briefing.See the digest

More in Vulnerabilities & Exploits

Telegram for Android Patches Voice Call Vulnerability Enabling Code Execution
Vulnerabilities & Exploits

Telegram for Android Patches Voice Call Vulnerability Enabling Code Execution

Security researchers at NebuSec disclosed a vulnerability in Telegram for Android that allowed remote code execution after a victim answered a voice call. The flaw affected versions from 8.6.2 through 12.10.3 and was fixed in release 12.10.4 at the end of September. The issue stemmed from improper handling of MediaState service messages that carry microphone, camera, and video rotation data during calls. When a required field was missing, the application accessed invalid memory. NebuSec discovered the bug using its Code Security product running on a GPT-5.4 model and confirmed exploitation on ARM64 Android devices for personal calls. A demonstration showed the string “HACKED BY NEBUSEC” appearing roughly 30 seconds after the call was accepted. The vulnerability is unrelated to the earlier animated-sticker attack vector.

AntiMalwareOct 29, 2026Translated from Russian

Yandex Patches Millions of Stations After eMudhra Certificate Keys Compromised
Vulnerabilities & Exploits

Yandex Patches Millions of Stations After eMudhra Certificate Keys Compromised

Yandex has automatically deployed security updates to millions of its smart speakers and partner televisions running YaOS between October 21 and 23. The patches address compromised intermediate certificates issued by eMudhra whose private keys consisted of trivial values from 1 to 255. Attackers who obtained these keys could generate fraudulent certificates and perform man-in-the-middle attacks against device HTTPS traffic. Enthusiasts demonstrated that local network control combined with the certificates allowed replacement of server configuration, activation of ADB, and acquisition of root access on the devices. The update removes trust in the affected certificates, overwrites compromised system files, and disables the debug interface. A factory reset restores the vulnerable firmware, so Yandex advises against resets without a compelling reason.

AntiMalwareOct 29, 2026Translated from Russian

Cisco ASA and FTD Face DoS Vulnerability in SSL VPN Already Exploited in the Wild
Vulnerabilities & Exploits

Cisco ASA and FTD Face DoS Vulnerability in SSL VPN Already Exploited in the Wild

Cisco Systems has disclosed a denial-of-service vulnerability affecting its Cisco Secure Firewall ASA and Cisco Secure Firewall FTD products. The flaw, tracked as CVE-2026-76418, resides in the SSL VPN remote access feature and carries a CVSS v3.1 base score of 8.6, rated High severity. Exploitation occurs when secondary authentication is configured on tunnel groups, allowing an attacker to send a crafted request that forces a device reboot without requiring authentication. Cisco confirmed active exploitation of the issue in October 2026. Security updates addressing the vulnerability are now available for both affected product lines. The advisory recommends immediate application of the patches to prevent service disruption.

Security NEXTOct 29, 2026Translated from Japanese