Jadaptive Maverick Synergy Server/Maverick Legacy Server up to 1.8.0/3.0.32/3.1.6 SSH Public Key Authentication improper authorization

Summaryinfo

A vulnerability marked as very critical has been reported in Jadaptive Maverick Synergy Server and Maverick Legacy Server up to 1.8.0/3.0.32/3.1.6. Affected by this issue is some unknown functionality of the component SSH Public Key Authentication. Performing a manipulation results in improper authorization. This vulnerability is known as CVE-2026-127090. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Jadaptive Maverick Synergy Server and Maverick Legacy Server up to 1.8.0/3.0.32/3.1.6. It has been classified as very critical. This affects an unknown code of the component SSH Public Key Authentication. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Jadaptive Maverick Synergy Server before 3.0.33 and 3.1.x before 3.1.7, and Maverick Legacy Server before 1.8.1, contain an authentication bypass vulnerability in SSH public key authentication that reuses cached key authorization decisions across usernames. Attackers holding a key authorized for one account can authenticate it, then send a signed SSH_MSG_USERAUTH_REQUEST with a different username on the same connection to log in as that account.

The advisory is shared at jadaptive.com. This vulnerability is uniquely identified as CVE-2026-127090 since 11/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/13/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 1.8.1, 3.0.33 or 3.1.7 eliminates this vulnerability.

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Productinfo

Vendor

• Jadaptive

Name

• Maverick Legacy Server
• Maverick Synergy Server

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8.0
• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.0.13
• 3.0.14
• 3.0.15
• 3.0.16
• 3.0.17
• 3.0.18
• 3.0.19
• 3.0.20
• 3.0.21
• 3.0.22
• 3.0.23
• 3.0.24
• 3.0.25
• 3.0.26
• 3.0.27
• 3.0.28
• 3.0.29
• 3.0.30
• 3.0.31
• 3.0.32
• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6

CPE 2.3info

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CPE 2.2info

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