Vulnerability record
CVE-2026-127090
The short answer
CVE-2026-127090 affects Jadaptive Maverick Synergy Server and is rated high (CVSS 8.7). It is not in CISA's Known Exploited Vulnerabilities catalog.
What it 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.
Weakness: CWE-305.
Severity
8.7 high
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
No score
FIRST scores CVEs within a day of publication
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- Low
- User interaction
- None
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Affected products
Maverick Synergy Server, Maverick Legacy Server. NVD's record lists the exact affected versions.
References
- github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-base/src/main/java/com/sshtools/common/auth/PublicKeyAuthentication.java#L82-L100
- github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-synergy-server/src/main/java/com/sshtools/server/AuthenticationProtocolServer.java#L185-L200
- github.com/sshtools/maverick-synergy/commit/f7d23182cce985e21048215e96395881295cb0bd
- jadaptive.com/security/advisories/JADAPTIVE-SA-2026-001
- store.jadaptive.com/app/api/releases/changes/01d04a39-0f05-4bae-842e-d2f1acc16985
- store.jadaptive.com/app/api/releases/changes/ff71bdcf-a2a2-47e0-af5a-22e15af1dfa4
- www.vulncheck.com/advisories/jadaptive-maverick-synergy-server-before-3.0.33-and-3.1-x-before-3.1.7-and-maverick-legacy-server-before-1.8.1-ssh-public-key-cross-user-authentication-bypass
Questions
Is CVE-2026-127090 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-13.
How do I fix CVE-2026-127090?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Received. The description is NVD's text, quoted as published.
Related
Know the day a CVE lands in your code
Connect a GitHub repository and ZeusQA checks its dependencies daily, briefs each advisory and opens the fix. Three test runs free, no card.