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Writer AI Session Token Leak Enables Account Takeover

Writer AI Session Token Leak Enables Account Takeover

ATLAS OWASP CRITICAL Active exploitation · Immediate action required ▲ 9.2 The Hacker News

A critical vulnerability dubbed WriteOut in the Writer enterprise AI platform allowed attackers to hijack victim session tokens across organisational boundaries using a malicious agent preview link. The flaw exploited Writer's live preview sandbox, which incorrectly forwarded authenticated session cookies into attacker-controlled execution environments. Writer has patched the issue by isolating sandbox origins and stripping session cookies from preview requests.

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