Latest cybersecurity reporting from selected sources.

CISA confirms BlueHammer (CVE-2026-33825) is now used in ransomware attacks to gain SYSTEM privileges through Microsoft Defender. BlueHammer, tracked as CVE-2026-33825, has moved from proof-of-concept noise to real ransomware attacks in the wild, the US CISA confirms. BlueHammer allows attackers to escalate privileges locally in Microsoft Defender. The vulnerability, along with two other zero-days dubbed […]

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

Cisco has patched a bug in Unified Communications Manager that lets an unauthenticated attacker on the network write files to the box and, from there, climb to root

Cisco patched a critical Unified CM flaw with public PoC code that allows unauthenticated attackers to launch SSRF attacks remotely. Cisco has addressed a high-severity vulnerability, tracked as CVE-2026-20230, affecting Unified CM and Unified CM SME. The flaw, caused by improper validation of certain HTTP requests, allows a remote attacker without authentication to perform server-side […]

Proof-of-concept (PoC) exploit code has now been released for a recently patched security flaw in the Linux kernel that could allow for local privilege escalation (LPE)

Researchers have released proof-of-concept (PoC) exploits for a critical Citrix NetScaler vulnerability, tracked as CVE-2025-5777 and dubbed CitrixBleed2, warning that the flaw is easily exploitable and can successfully steal user session tokens. [...]

A proof-of-concept exploit has been publicly released for a maximum severity Apache Parquet vulnerability, tracked as CVE-2025-30065, making it easy to find vulnerable servers. [...]

A recently patched critical Apache Struts 2 vulnerability tracked as CVE-2024-53677 is actively exploited using public proof-of-concept exploits to find vulnerable devices. [...]

A proof-of-concept (PoC) exploit for CVE-2024-29847, a critical remote code execution (RCE) vulnerability in Ivanti Endpoint Manager, is now publicly released, making it crucial to update devices. [...]

A proof-of-concept (PoC) exploit for a Veeam Backup Enterprise Manager authentication bypass flaw tracked as CVE-2024-29849 is now publicly available, making it urgent that admins apply the latest security updates. [...]

Researchers found roughly 45,000 Jenkins instances exposed online that are vulnerable to CVE-2023-23897, a critical remote code execution (RCE) flaw for which multiple public proof-of-concept (PoC) exploits are in circulation. [...]

Hackers are attempting to leverage a recently fixed critical vulnerability (CVE-2023-50164) in Apache Struts that leads to remote code execution, in attacks that rely on publicly available proof-of-concept exploit code. [...]

Following the publication of the critical Linux security vulnerability, security specialists released PoC exploits to test the implications of CVE-2023-4911.

Security researchers have released a proof-of-concept exploit for a critical-severity vulnerability (CVE-2022-39952) in Fortinet's FortiNAC network access control suite. [...]

Security researchers have released a proof-of-concept exploit for a critical-severity vulnerability (CVE-2022-39952) in Fortinet's FortiNAC network access control suite. [...]

Unpatched Cisco bugs, tracked as CVE-2023-20025 and CVE-2023-20026, allow lateral movement, data theft, and malware infestations.

A proof-of-concept (PoC) code demonstrating a newly disclosed digital signature bypass vulnerability in Java has been shared online.  The high-severity flaw in question, CVE-2022-21449 (CVSS score: 7.5), impacts the following version of Java SE and Oracle GraalVM Enterprise Edition - Oracle Java SE: 7u331, 8u321, 11.0.14, 17.0.2, 18 Oracle GraalVM Enterprise Edition: 20.3.5, 21.3.1, 22.0.0.2