Daily Security Briefing #051

October 25, 2025 | Read Online

Windows Server RCE exploit active, CoPhish targets OAuth tokens, WordPress plugins under attack…

Executive Summary

Today’s cybersecurity landscape highlights escalating threats targeting enterprise infrastructure and cloud environments. Notably, a critical remote code execution vulnerability in Windows Server Update Services is actively exploited, raising immediate concerns for organizations running WSUS. Phishing attacks grow more sophisticated as the new CoPhish technique abuses Microsoft Copilot Studio agents to steal OAuth tokens. WordPress websites remain prime targets, with widespread exploitation of critical plugin vulnerabilities allowing unauthorized malicious installations. Meanwhile, cloud security continues to evolve, with numerous platforms emerging to address protection, access control, penetration testing, and bug bounty management in complex multi-cloud settings.

Top Articles

CISA Beware! Hackers Are Actively Exploiting Windows Server Update Services RCE Flaw in the Wild
Security researchers report active exploitation of a severe RCE vulnerability (CVE-2025-59287) in Microsoft’s WSUS that enables unauthenticated attackers to execute arbitrary code on vulnerable servers. Attackers appear to be conducting manual attacks, underscoring serious risk to enterprise update infrastructures if unpatched.
Links: GBHackers

New CoPhish attack steals OAuth tokens via Copilot Studio agents
A novel phishing campaign called CoPhish abuses Microsoft Copilot Studio agents, sending fraudulent OAuth consent requests through trusted Microsoft domains. This innovative attack method targets OAuth tokens, potentially compromising user credentials and access to cloud services.
Links: BleepingComputer

Hackers Exploit WordPress Arbitrary Installation Vulnerabilities in the Wild
Wordfence uncovered a surge in exploitation of critical vulnerabilities in popular WordPress plugins GutenKit and Hunk Companion. The flaws allow unauthorized attackers to install malicious code and potentially seize control of thousands of websites, highlighting persistent risks in plugin security.
Links: GBHackers

$1M WhatsApp Hack Flops: Only Low-Risk Bugs Disclosed to Meta After Pwn2Own Withdrawal
Following a high-profile withdrawal from the Pwn2Own contest, only low-impact WhatsApp vulnerabilities were disclosed to Meta. These flaws, deemed incapable of arbitrary code execution, diminish fears of a critical exploit but emphasize continued scrutiny on messaging app security.
Links: SecurityWeek

OpenAI Atlas Omnibox Is Vulnerable to Jailbreaks
Researchers found that OpenAI’s Atlas Omnibox can be tricked into executing disguised prompts by accepting them as URLs, exposing a jailbreak vulnerability. This weakens trust in the omnibox’s input validation and poses risks for NLP model manipulation.
Links: SecurityWeek

Hackers Use ClickFix Technique to Deploy NetSupport RAT Loaders
Threat actors increasingly favor the “ClickFix” access vector to deliver NetSupport RAT loaders, replacing prior methods like fake updates. This strategy abuses social engineering to gain initial access and control endpoints stealthily.
Links: GBHackers

Top 10 Best Cloud Workload Protection Platforms (CWPP) in 2025
A comprehensive overview of the leading Cloud Workload Protection Platforms highlights how organizations are securing virtual machines, containers, serverless functions, and sensitive data amid rapidly growing cloud adoption. These CWPPs form a critical defense layer in the shared responsibility security model.
Links: GBHackers

Top 10 Best Cloud Access Security Brokers (CASB) in 2025
Examining the top CASB solutions, the report addresses challenges of securing sprawling SaaS, PaaS, and IaaS use in enterprises. CASBs help close cloud security gaps, enforce policies, and manage compliance amid complex multi-cloud and hybrid environments.
Links: GBHackers

Top 10 Best Cloud Penetration Testing Providers in 2025
This list showcases providers specializing in cloud penetration testing across AWS, Azure, and GCP, essential for validating security postures and uncovering misconfigurations or vulnerabilities in cloud infrastructure and applications.
Links: GBHackers

Top 10 Best Bug Bounty Platforms in 2025
Highlighting platforms that connect organizations with ethical hackers, this article underlines growing reliance on bug bounty programs to proactively identify vulnerabilities across cloud, AI, and Web3 technologies, delivering scalable and cost-effective security testing.
Links: GBHackers

Top 10 Best Cloud Security Companies For AWS, Azure And GCP in 2025
With cloud adoption accelerating, this overview identifies key security vendors assisting enterprises to secure multi-cloud deployments. These companies offer integrated tools and services to address diverse risks and optimize cloud security strategies across major cloud providers.
Links: GBHackers

AI Transparency: This newsletter uses AI to curate, rank, and summarize cybersecurity content from leading industry blogs. All articles link directly to original authors. Executive summaries are AI-generated based on article content. I curate the sources and deliver the digest—the original authors deserve the credit for their excellent work.