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Microsoft has shut down a long-running malicious extension operation on the Edge Add-ons store that hid its payloads inside ordinary image and font files, then woke up days after install to steal credentials and run ad fraud. The company calls it  StegoAd , a mash-up of steganography and adware, and ties 119 extensions to a single threat actor it says has been active since at least 2021. The extensions were the kind people install without a second thought: ad blockers, VPNs, translators, video downloaders. Each one did its job and earned reviews. The malicious code stayed dormant until the extension cleared a stack of evasion checks, which is how it sat in the store for years. Combined, the 119 extensions had an install base of up to 2.6 million users. Microsoft is clear that this is a ceiling, not a victim count. A multi-day delay, server-side validation, and a 10% execution gate on some variants meant the payload never fired for many installs. How many people were actual...

A public proof-of-concept is now out for CVE-2026-55200 , a critical flaw in libssh2 that lets a malicious or compromised SSH server trigger memory corruption on a connecting client, with possible code execution. No credentials, no user interaction. The bug affects every release up to and including 1.11.1 and carries a CVSS 4.0 score of 9.2 . libssh2 is a client-side SSH library, not a server. That distinction matters. It is embedded in curl, Git, PHP, backup agents, firmware updaters, and a long tail of appliances. Anything that links it and reaches out to an untrusted SSH endpoint is a potential target. Many of those copies are statically linked, so a distro package update will not touch them, and you may not know they are there. How the bug works The flaw lives in ssh2_transport_read() in transport.c, the function that parses incoming SSH packets during the handshake. It read the attacker-controlled packet_length field and rejected only values belo...

Cybersecurity researchers have uncovered two hijacked npm packages and a cluster of Go packages that are designed to deploy a Python-based information stealer on compromised Windows, Linux, and macOS hosts. "This attack avoids the most common npm execution paths through lifecycle scripts, perhaps in an attempt to remain 'compatible' with npm v12's security hardenings ," JFrog said in a technical analysis. "The package hides execution inside a VS Code task, configured to run automatically when the project folder is opened in VS Code. From there, the malware retrieves encrypted JavaScript from blockchain transaction data, connects to attacker-controlled infrastructure, launches a socket.io backdoor, and eventually deploys a Python infostealer. The names of the identified npm packages are listed below - html-to-gutenberg fetch-page-assets (which lists html-to-gutenberg as a dependency) The two packages were uploaded to npm on May 25, 2026, an...

The Security Service of Ukraine (SSU) said it, together with the U.S. Federal Bureau of Investigation (FBI), uncovered a long-running campaign orchestrated by Russian intelligence services to break into the messaging accounts of government officials, military personnel, politicians, and activists in Ukraine, Europe, and the U.S. The systematic cyber attacks aimed at stealing sensitive information from the victims, the agency added. "The goal of these 'hacks' is to gain access to sensitive military, political, and economic information exchanged by users, as well as to steal their personal data," the agency warned in a post shared on Telegram. To pull off the operation, the attackers send SMS messages that masquerade as the messaging platform's support bot and urge users to disclose their account credentials.  The SSU noted that these attacks include not only organizations, officials or public figures, but also personal accounts belonging to Ukrainian nati...

OpenAI on Friday released three versions of GPT-5.6 , called Sol, Terra, and Luna , as a limited preview to a small number of companies as part of an ongoing engagement with the U.S. government. While Sol is the latest flagship model and the most powerful, Terra strikes a balance between efficiency and power, and Luna is fine-tuned for speed and affordability. "GPT‑5.6 Sol launches with our most robust safety stack to date. We strengthened protections for higher-risk activity, sensitive cyber requests, and repeated misuse, and spent multiple weeks finding weaknesses, pressure-testing our system, and hardening it against real-world attacks," OpenAI said . The model has also been touted as the "most capable model yet" for cybersecurity, making it much more suitable for vulnerability research and exploitation. On ExploitBench , GPT‑5.6 Sol is competitive with Anthropic Mythos Preview using only about one-third of the output tokens, OpenAI noted. The goal, ...

The FBI and CISA have updated  their March warning  about Russian intelligence phishing Signal accounts, and the operators have added a step: they now coax targets into handing over their Signal Backup Recovery Key. Hand it over once, and the attacker can restore the account's backup, read the private and group message history, and take over the account. Worse, the key keeps working. Make a new account on the same phone number, and the old key can still be used against it, the advisory warns. The fix is blunt: generate a new key in Settings, which kills the old one for future backup downloads, and accept that anything the attacker already pulled is gone. The updated advisory, PSA I-062626-PSA , adds two public tracking names the March notice lacked: UNC5792 and UNC4221. The FBI ties the activity to multiple Russian Intelligence Services (RIS) groups, including FSB officers embedded with the FSB Border Guards and others working for the Russian military services. The ca...

A newly discovered cyber attack campaign has been observed delivering a previously undocumented malware family called SharkLoader that acts as a loader for deploying Cobalt Strike Beacon on compromised hosts. Kaspersky, which is tracking the activity under the moniker StrikeShark , said the campaign has targeted a diplomatic organization in Indonesia, government organizations in Taiwan, software development companies across multiple countries, and entities associated with other sectors located in Hong Kong, Lebanon, Syria, Colombia, North Macedonia, Nepal, and Serbia.  "The observed victimology suggests a campaign with broad geographic reach and a diverse target set rather than a narrow focus on a specific industry or region," the Russian cybersecurity vendor said . The campaign does not exhibit direct links to any known threat actor or group, although the operators have utilized several open-source post-compromise tools like FScan and Pillager , which are commonly p...