MeridianMeridian

Critical SSRF Vulnerability in AWS SSM Agent Allows IAM Credential Theft via Port Forwarding Bypass

Amazon Web Services has disclosed a high-severity server-side request forgery vulnerability in the AWS Systems Manager Agent. The flaw, tracked as CVE-2026-89049, affects the port forwarding feature used by Session Manager and stems from insufficient validation that permits bypass of deny-list restrictions on link-local addresses. Successful exploitation requires port-forwarding permissions but can lead to unauthorized access to instance metadata and temporary IAM role credentials. The company rated the issue as Important with CVSSv4.0 base score 8.5 and CVSSv3.1 score 9.9. The vulnerability was addressed in version 3.3.4851.0 released on 13 July 2026, prior to the public advisory issued on 10 September 2026.

Security NEXTTranslated from Japanese

Read at source

Amazon Web Services has published a security advisory detailing a serious vulnerability in the AWS Systems Manager Agent (SSM Agent). The software works in conjunction with the cloud management service AWS Systems Manager to enable remote administration of EC2 instances and on-premises servers.

The flaw, identified as CVE-2026-89049, is a server-side request forgery (SSRF) issue located in the port-forwarding functionality of Session Manager. Insufficient input validation allows an attacker who already possesses port-forwarding rights to bypass deny-list protections by encoding link-local addresses in alternative formats.

Successful exploitation could let an attacker reach link-local endpoints from a managed instance and retrieve temporary security credentials associated with the instance’s IAM role. These credentials could then be used to access other AWS resources within the same account.

AWS assigned the advisory a severity rating of “Important.” The vulnerability received a CVSSv4.0 base score of 8.5 and a CVSSv3.1 base score of 9.9.

The company stated that the issue was resolved in version 3.3.4851.0 of the SSM Agent, released on 13 July 2026. Customers are advised to ensure all managed instances are running the patched agent version.

AWS SSM AgentCVE-2026-89049AWS Systems Manager
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