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Overview On July 27, 2026, JetBrains published a security advisory for CVE-2026-63077 , a critical unsafe deserialization vulnerability affecting JetBrains TeamCity . An attacker who can reach a TeamCity server over HTTP or HTTPS can exploit the agent polling protocol without credentials and execute operating system commands with the privileges of the TeamCity server process. JetBrains reported no known active exploitation when it disclosed the vulnerability. However, on August 5, 2026, CISA added CVE-2026-63077 to its Known Exploited Vulnerabilities (KEV) catalog, confirming exploitation in the wild. Our analysis finds that a vulnerable TeamCity server creates a permissive XStream allowlist. This allowlist is intended to restrict which Java classes can be deserialized when servicing unauthenticated agent requests. However, this allowlist incorrectly adds TeamCity protocol classes without removing XStream's existing default permissions. This introduces an unsafe deserialization issue. A patched TeamCity server remediates this by adding NoTypePermission.NONE before the TeamCity allowlist, which removes the default permissions and makes the allowlist exclusive. Rapid7 Labs has verifi

By Yarden Porat, Check Point Research Key Points The short version We set out to break Cloudflare Code Mode, and ended up breaking Cloudflare Workers too. We did both by targeting workerd, the runtime beneath both: an in-process sandbox that relies entirely on V8 to isolate untrusted code. We found five memory-corruption bugs in workerd’s native C++ (the “glue”

Attackers used SQL injection to compile a post-exploitation toolkit inside an Oracle database

One of Meta’s AI models exploited a third-party security flaw during an evaluation, the latest in a series of similar incidents involving advanced AI systems

Apple has imposed strict new submission limits on its bug bounty portal after finding itself overwhelmed by low-quality, AI generated vulnerability reports - many of which were found to be describing security flaws that simply didn't exist. Read more in my article on the Hot for Security blog.

Discover how attackers hijack AI tokens to fuel gray market transfer stations by stealing developer API keys.

3 Paperclip flaws exposed data & allowed unauthenticated command execution in two deployment modes