All news in category “Security Advisory and Patch Watch”

🚨 The Australian Cyber Security Centre (ACSC) has warned of a widespread campaign using compromised WordPress sites and the ClickFix social‑engineering technique to deliver the Vidar Stealer infostealer to Windows systems. Attackers lure victims with fake CAPTCHA prompts that trick users into executing malicious commands, enabling in‑memory persistence and evasion. The ACSC advises restricting unauthorised execution, keeping WordPress and OS components patched, limiting clipboard write access, and enforcing phishing‑resistant MFA.

🔍 A healthcare customer bought servers in 2017 and, due to COVID-era lifecycle extensions and current supply-chain bottlenecks, now faces expiring vendor support and long lead times that prevent timely hardware refresh. The article recommends building a complete inventory using scanners (Nessus, Qualys, Rapid7, Greenbone/OpenVAS), network discovery (Nmap) and device fingerprinting (runZero), then mapping assets to NVD and CISA Known Exploited Vulnerabilities (KEV). Use a weighted risk formula to prioritize remediation and sort systems into immediate, managed, and monitored tiers. Document risk acceptance, deploy compensating controls where needed, and consider continuous monitoring with Wazuh.

⚠ A newly disclosed Linux zero-day, named Dirty Frag, enables local attackers to obtain root privileges on most major distributions with a single command. Researcher Hyunwoo Kim published a detailed write-up and a proof-of-concept exploit after an embargo was broken on May 7, 2026. The flaw stems from an approximately nine-year-old logic error in the kernel's algif_aead interface and chains two page-cache write issues to modify protected files in memory. As a temporary mitigation, administrators are advised to disable and unload the esp4, esp6, and rxrpc modules until vendor patches are available.

🔒 A new unpatched local privilege escalation in the Linux kernel, called Dirty Frag, was disclosed to maintainers on April 30, 2026. Researcher Hyunwoo Kim (@v4bel) says it deterministically chains two page-cache write primitives (xfrm-ESP and RxRPC) to achieve root on many distributions, and a one-command PoC has been released. Vendors recommend immediately blocklisting the esp4, esp6, and rxrpc modules and monitoring upstream and vendor advisories for patches.

⚠️ Palo Alto Networks has confirmed a critical zero-day in PAN-OS's Captive Portal (CVE-2026-0300) that allows unauthenticated remote code execution as root on exposed PA and VM series firewalls. Reporting indicates suspected state-sponsored actors exploited the flaw for nearly a month. Palo Alto plans updates beginning May 13; customers should restrict or disable the portal until patches are available.

⚠️ Thirteen critical vulnerabilities have been disclosed in the vm2 JavaScript sandbox, including a full sandbox escape (CVE-2026-26956) that can allow attacker-controlled code to execute host commands under specific Node.js 25/WebAssembly conditions. Another high-risk issue (CVE-2026-44007) involves NodeVM nesting interacting with the legacy module resolver and was patched in 3.11.1. Developers should upgrade to vm2 3.11.2 immediately and consider interim mitigations such as avoiding Node 25 runtimes or disabling WebAssembly for untrusted sandboxes.

🦙 A critical vulnerability in Ollama (CVE-2026-7482) allows unauthenticated attackers to upload a crafted GGUF model file and trigger an out-of-bounds heap read in the model quantization pipeline. The flaw can leak process memory — including system prompts, conversation history, environment variables, API keys, and other secrets — to remote servers. Update to Ollama 0.17.1 and restrict network access.

⚠️ Microsoft researchers disclosed critical vulnerabilities in Semantic Kernel that allow prompt injection to escalate into host-level remote code execution and arbitrary file writes. The team detailed two fixed issues — CVE-2026-26030 (unsafe eval-style filter in the In-Memory Vector Store) and CVE-2026-25592 (exposed DownloadFileAsync in SessionsPythonPlugin) — and provided mitigations. Operators should upgrade the Python package to 1.39.4+ and the .NET SDK to 1.71.0+, validate any model-influenced tool parameters as untrusted input, and hunt endpoint telemetry for post-exploitation indicators.

⚠️ The Australian Cyber Security Center (ACSC) warns of an ongoing campaign using the ClickFix social-engineering technique to deliver Vidar Stealer. Attackers compromise WordPress sites and redirect visitors to pages that display fake Cloudflare verification or CAPTCHA prompts instructing users to copy and execute malicious PowerShell commands. Once executed, the payload launches Vidar, which operates from memory and targets browser credentials, cookies, cryptocurrency wallets, autofill data, and system information. ACSC advises restricting PowerShell execution, applying application allow-listing, and keeping WordPress themes and plugins updated or removed when unused.

🛡️ Ivanti warns of a high-severity flaw, CVE-2026-6973 (CVSS 7.2), in Endpoint Manager Mobile (EPMM) that has been observed in limited active exploitation and permits remote code execution for remotely authenticated users with administrative access. The issue affects on-premises EPMM versions before 12.6.1.1, 12.7.0.1, and 12.8.0.1 and was released alongside patches for four additional vulnerabilities. CISA added CVE-2026-6973 to its KEV catalog with a May 10, 2026 remediation deadline; Ivanti advises applying updates and rotating credentials as appropriate.

🔒 Ivanti is urging customers to patch a high-severity remote code execution flaw (CVE-2026-6973) in Endpoint Manager Mobile (EPMM) after limited zero-day exploitation. The weakness stems from improper input validation and affects on-prem EPMM 12.8.0.0 and earlier; Ivanti released fixes in 12.6.1.1, 12.7.0.1, and 12.8.0.1 and recommends reviewing and rotating admin credentials. The vendor also patched four additional high-severity EPMM issues and noted that Shadowserver currently sees over 850 exposed EPMM hosts online.

🔒 A critical WebSocket vulnerability in Cline's Kanban server (CVSS 9.7) allows any webpage a developer visits to silently exfiltrate workspace data, inject terminal commands and terminate agent sessions. Disclosed by Oasis Security on May 7, it affects the Kanban npm package v0.1.59 and stems from missing origin validation and authentication on three local WebSocket endpoints. Updating to v0.1.66 and disabling the default bypass permissions flag are recommended mitigations.

🔒 Cloudflare assessed and mitigated the Linux local privilege escalation named Copy Fail (CVE-2026-31431) following public disclosure on 2026-04-29. Our behavioral detections flagged the exploit chain within minutes during validation, and threat hunting across a 48-hour window found no evidence of compromise. We deployed an eBPF LSM allow-list (bpf-lsm) to block AF_ALG binds for non-allow-listed binaries, built and staged patched LTS kernels, and completed fleet protection via controlled reboots with no customer impact.

⚠️The MAXHUB Pivot client (versions prior to v1.36.2) contains a vulnerability (CVE-2026-6411) that can expose tenant email addresses and related metadata in cleartext due to a hardcoded AES key embedded in the application. An attacker who obtains the encrypted data can decrypt it, and the product's MQTT enrollment mechanism may be abused to register multiple unauthorized devices, potentially causing denial of service. MAXHUB released v1.36.2 via OTA; update immediately.

🔔 CISA has added one vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog: CVE-2026-6973, an Ivanti Endpoint Manager Mobile (EPMM) improper input validation flaw. CISA cites evidence of active exploitation and emphasizes the significant risk this class of vulnerability poses to the federal enterprise. The agency reminds FCEB agencies of remediation requirements under BOD 22-01 and strongly urges all organizations to prioritize timely fixes.

🔒 Palo Alto Networks warned of a critical buffer overflow in PAN-OS affecting the User-ID Authentication Portal (CVE-2026-0300) that can allow unauthenticated attackers to execute code as root on exposed PA- and VM-Series firewalls. The vendor says only portals reachable from untrusted IPs are at risk; Prisma Access, Cloud NGFW and Panorama are not impacted. Customers are advised to restrict portal access, disable the Captive Portal if unused, disable Response Pages on untrusted interfaces, and apply mitigations until patched builds roll out in May.

🔴 Palo Alto Networks warns that suspected state‑sponsored actors have exploited a critical PAN‑OS zero‑day (CVE-2026-0300) in the User‑ID Authentication Portal, enabling unauthenticated remote code execution as root on exposed PA‑ and VM‑Series firewalls. Unit 42 says initial probing began April 9, with successful exploitation occurring about a week later; attackers cleaned logs and deployed tunneling tools. Palo Alto notes Cloud NGFW and Panorama are not affected and will issue patches starting May 13; administrators should restrict or disable the authentication portal until updates are applied.

⚠️ Multiple critical vulnerabilities have been disclosed in the vm2 Node.js library that allow untrusted code to break out of sandboxes and execute arbitrary host commands. The defects include numerous sandbox escapes, code injection vectors, and an allowlist bypass, with several issues rated CVSS 9.8–10.0. Affected releases span multiple 3.9.x–3.11.x builds; maintainers recommend upgrading to v3.11.2 and auditing any vm2-based sandbox deployments. The project lead has acknowledged that further bypasses are likely as research continues.

🔒 Unit 42 details exploitation of a buffer overflow vulnerability (CVE-2026-0300) in the PAN-OS User-ID Authentication Portal that permits unauthenticated remote code execution as root on affected PA‑Series and VM‑Series firewalls. Observed adversary activity included shellcode injection into an nginx worker, rapid log and evidence cleanup, and deployment of tunneling tools such as EarthWorm and ReverseSocks5. Immediate mitigations are to restrict or disable the portal, apply vendor guidance, and enable available threat signatures and protections.

🚨 A critical vulnerability in the Node.js sandbox library vm2 (CVE-2026-26956) can be exploited to escape the sandbox and execute arbitrary code on the host. The issue has been confirmed in vm2 3.10.4 on Node.js 25 (tested on 25.6.1) when WebAssembly exception handling and JSTag support are enabled. A proof-of-concept exploit is public; users should upgrade to vm2 3.10.5 or later (latest 3.11.2) immediately.