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Researcher to release exploit for full auth bypass on FortiWeb

A security researcher has released a partial proof of concept exploit for a vulnerability in the FortiWeb web application firewall that allows a remote attacker to bypass authentication. The flaw was reported responsibly to Fortinet and is now tracked as CVE-2025-52970. Fortinet released a fix on August 12. Security researcher Aviv Y named the vulnerability FortMajeure and describes it as a "silent failure that wasn’t meant to happen." Technically, it is an out-of-bounds read in FortiWeb’s coo

Fortinet warns of FortiSIEM pre-auth RCE flaw with exploit in the wild

Fortinet is warning about a remote unauthenticated command injection flaw in FortiSIEM that has in-the-wild exploit code, making it critical for admins to apply the latest security updates. FortiSIEM is a central security monitoring and analytics system used for logging, network telemetry, and security incident alerts, serving as an integral part of security operation centers, where it's an essential tool in the hands of IT ops teams and analysts. The product is generally used by governments,

Spike in Fortinet VPN brute-force attacks raises zero-day concerns

A massive spike in brute-force attacks targeted Fortinet SSL VPNs earlier this month, followed by a switch to FortiManager, marked a deliberate shift in targeting that has historically preceded new vulnerability disclosures. The campaign, detected by threat monitoring platform GreyNoise, manifested in two waves, on August 3 and August 5, with the second wave pivoting to FortiManager targeting with a different TCP signature. As GreyNoise previously reported, such spikes in deliberate scanning a

New Fortinet FortiWeb hacks likely linked to public RCE exploits

Multiple Fortinet FortiWeb instances recently infected with web shells are believed to have been compromised using public exploits for a recently patched remote code execution (RCE) flaw tracked as CVE-2025-25257. News of the exploitation activity comes from threat monitoring platform The Shadowserver Foundation, which observed 85 infections on July 14 and 77 on the next day. The researchers reported that these Fortinet FortiWeb instances are believed to be compromised through the CVE-2025-252