CVE-2026-18668

IBM Sterling File Gateway and IBM Sterling B2B Integrator are vulnerable to a protection mechanism failure (CWE-693) due to a security misconfiguration. This flaw could allow a remote attacker to perform protocol downgrade attacks . Affected versions include IBM Sterling File Gateway 6.2.1.0 thro...

EUVD-2026-119703

IBM Sterling File Gateway 6.2.1.0 through 6.2.1.21 and 6.2.2.0 - 6.2.2.11 could allow a remote attacker to perform protocol downgrade attacks due to a security misconfiguration...

CVE-2026-123497

Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path attackers to force plain HTTP during veans init and login. Attackers can block HTTPS ports so discovery accepts an unverified HTTP response, capturing passwords, TOTP codes or bot tokens...

EUVD-2026-119370

rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to se...

CVE-2026-123611

Versions of rustls before 0.23.46 are vulnerable to a key exchange downgrade vulnerability. A network attacker can poison the per-server-name key-exchange group record by sending an unauthenticated ServerHello . By selecting X25519 in one connection, the attacker can force subsequent ClientHellos...

CVE-2026-123497 Vikunja veans before 2.7.1 HTTPS to HTTP Downgrade in Server Discovery

Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path attackers to force plain HTTP during veans init and login. Attackers can block HTTPS ports so discovery accepts an unverified HTTP response, capturing passwords, TOTP codes or bot tokens...

CVE-2026-123497

Vikunja veans versions prior to 2.7.1 are susceptible to a protocol downgrade vulnerability within the serverCandidates component. This flaw allows an on-path attacker to force the application to use plain HTTP during the veans init and login processes by blocking HTTPS ports. Consequently, the d...

EUVD-2026-119382

Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path attackers to force plain HTTP during veans init and login. Attackers can block HTTPS ports so discovery accepts an unverified HTTP response, capturing passwords, TOTP codes or bot tokens...

CVE-2026-123611: rustls: rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the…

rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to se...

PT-2026-139892

rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to se...

PT-2026-139778

Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path attackers to force plain HTTP during veans init and login. Attackers can block HTTPS ports so discovery accepts an unverified HTTP response, capturing passwords, TOTP codes or bot tokens...

CVE-2026-123497: go-vikunja vikunja: Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path…

Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path attackers to force plain HTTP during veans init and login. Attackers can block HTTPS ports so discovery accepts an unverified HTTP response, capturing passwords, TOTP codes or bot tokens...

smugglefuzz

SmuggleFuzz SmuggleFuzz, a configurable and rapid HTTP downgrade smuggling scanner. Empowering users with customizable gadget lists, it offers deeper insights into the reasons behind failed smuggling attacks. I am confident that numerous HTTP downgrade-based smuggling vulnerabilities remain...

unicorn

unicorn Written by: Dave Kennedy @HackingDave Website: https://www.trustedsec.com Magic Unicorn is a simple tool for using a PowerShell downgrade attack and inject shellcode straight into memory. Based on Matthew Graeber's powershell attacks and the powershell bypass technique presented by David...

Seth

Seth Seth is a tool written in Python and Bash to MitM RDP connections by attempting to downgrade the connection in order to extract clear text credentials. It was developed to raise awareness and educate about the importance of properly configured RDP connections in the context of pentests,...

http-request-smuggler

HTTP Request Smuggler This Burp Suite extension automatically detects and exploits HTTP Request Smuggling vulnerabilities using advanced desynchronization techniques developed by PortSwigger researcher James Kettle. It supports comprehensive scanning for HTTP/1.1 and HTTP/2-downgrade desync...

NetNTLMtoSilverTicket

SpoolSample - NetNTLMv1 - NTLM - Silver Ticket This technique has been alluded to by others, but I haven't seen anything cohesive out there. Below we'll walk through the steps of obtaining NetNTLMv1 Challenge/Response authentication, cracking those to NTLM Hashes, and using that NTLM Hash to sign...

SMBetray

SMBetray Version 1.0.0. This tool is a PoC to demonstrate the ability of an attacker to intercept and modify insecure SMB connections, as well as compromise some secured SMB connections if credentials are known. Background Released at Defcon26 at "SMBetray - Backdooring and Breaking Signatures" I...

mellon

OSDP Vulnerabilities this Exploits OSDP attack tool and the Elvish word for friend Attack 1: Encryption is Optional OSDP supports, but doesn't strictly require , encryption. So your connection might not even be encrypted at all. Attack 1 is just to passively listen and see if you can read the car...

lsarelayx

lsarelayx Introduction lsarelayx is system wide NTLM relay tool designed to relay incoming NTLM based authentication to the host it is running on. lsarelayx will relay any incoming authentication request which includes SMB. Since lsarelayx hooks into existing application authentication flows, the...