Search results for OpenAI Assistants API | Breaking Cybersecurity News | The Hacker News

Microsoft has disclosed details of a novel backdoor dubbed SesameOp that uses OpenAI Assistants Application Programming Interface (API) for command-and-control (C2) communications. "Instead of relying on more traditional methods, the threat actor behind this backdoor abuses OpenAI as a C2 channel as a way to stealthily communicate and orchestrate malicious activities within the compromised environment," the Detection and Response Team (DART) at Microsoft Incident Response said in a technical report published Monday. "To do this, a component of the backdoor uses the OpenAI Assistants API as a storage or relay mechanism to fetch commands, which the malware then runs." The tech giant said it discovered the implant in July 2025 as part of a sophisticated security incident in which unknown threat actors had managed to maintain persistence within the target environment for several months. It did not name the impacted victim. Further investigation into the intrusio...

A high-severity security flaw has been disclosed in Meta's Llama large language model (LLM) framework that, if successfully exploited, could allow an attacker to execute arbitrary code on the llama-stack inference server.  The vulnerability, tracked as CVE-2024-50050 , has been assigned a CVSS score of 6.3 out of 10.0. Supply chain security firm Snyk, on the other hand, has assigned it a critical severity rating of 9.3. "Affected versions of meta-llama are vulnerable to deserialization of untrusted data, meaning that an attacker can execute arbitrary code by sending malicious data that is deserialized," Oligo Security researcher Avi Lumelsky said in an analysis earlier this week. The shortcoming, per the cloud security company, resides in a component called Llama Stack , which defines a set of API interfaces for artificial intelligence (AI) application development, including using Meta's own Llama models. Specifically, it has to do with a remote code execution ...

The maintainers of the nx build system have alerted users to a supply chain attack that allowed attackers to publish malicious versions of the popular npm package and other auxiliary plugins with data-gathering capabilities. "Malicious versions of the nx package, as well as some supporting plugin packages, were published to npm, containing code that scans the file system, collects credentials, and posts them to GitHub as a repo under the user's accounts," the maintainers said in an advisory published Wednesday. Nx is an open-source, technology-agnostic build platform that's designed to manage codebases. It's advertised as an "AI-first build platform that connects everything from your editor to CI [continuous integration]." The npm package has over 3.5 million weekly downloads. The list of affected packages and versions is below. These versions have since been removed from the npm registry. The compromise of the nx package took place on August 26, 20...

Behind every click, there's a risk waiting to be tested. A simple ad, email, or link can now hide something dangerous. Hackers are getting smarter, using new tools to sneak past filters and turn trusted systems against us. But security teams are fighting back. They're building faster defenses, better ways to spot attacks, and stronger systems to keep people safe. It's a constant race — every move by attackers sparks a new response from defenders. In this week's ThreatsDay Bulletin, we look at the latest moves in that race — from new malware and data leaks to AI tools, government actions, and major security updates shaping the digital world right now. U.K. moves to tighten cyber rules for key sectors U.K. Debuts Cyber Security and Resilience Bill The U.K. government has proposed a new Cyber Security and Resilience Bill that aims to strengthen national security and secure public services like healthcare, drinking wat...

Every tap, click, and swipe we make online shapes our digital lives, but it also opens doors—some we never meant to unlock. Extensions we trust, assistants we rely on, and even the codes we scan are turning into tools for attackers. The line between convenience and vulnerability has never been thinner. This week, we dive into the hidden risks, surprising loopholes, and the clever tricks cybercriminals are using to outsmart the systems we depend on. Stay with us as we unpack what's happening behind the screen and how you can stay one step ahead. ⚡ Threat of the Week Dozens of Google Chrome Extensions Caught Stealing Sensitive Data — The challenges with securing the software supply chain reared once again after about three dozen extensions were found surreptitiously siphoning sensitive data from roughly 2.6 million devices for several months as part of two related campaigns. The compromises came to light after data loss prevention service Cyberhaven revealed that its browser extens...