Spring Integration SMB1 Downgrade via jCIFS Client (v6.4-7.1)
CVE-2026-59293 Published on August 27, 2026
SMB minimum protocol dialect defaults to SMB1
Unless the application explicitly raises smbMinVersion, the jCIFS client will negotiate down to SMB1/CIFS, which lacks mandatory signing/encryption and is vulnerable to NTLM relay and content-tampering MITM.
Spring Integration 7.1.0
Spring Integration 7.0.0 - 7.0.5
Spring Integration 6.5.0 - 6.5.10
Spring Integration 6.4.0 - 6.4.12
Vulnerability Analysis
CVE-2026-59293 can be exploited with network access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is an Algorithm Downgrade Vulnerability?
A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used as a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties. When a security mechanism can be forced to downgrade to use a less secure algorithm, this can make it easier for attackers to compromise the software by exploiting weaker algorithm. The victim might not be aware that the less secure algorithm is being used. For example, if an attacker can force a communications channel to use cleartext instead of strongly-encrypted data, then the attacker could read the channel by sniffing, instead of going through extra effort of trying to decrypt the data using brute force techniques.
CVE-2026-59293 has been classified to as an Algorithm Downgrade vulnerability or weakness.
Products Associated with CVE-2026-59293
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Affected Versions
Spring Integration:- Version 7.1.0 is affected.
- Version 7.0.0, <= 7.0.5 is affected.
- Version 6.5.0, <= 6.5.10 is affected.
- Version 6.4.0, <= 6.4.12 is affected.