Jadaptive Maverick Synergy Server before 3.0.33 and 3.1.x before 3.1.7, and Maverick Legacy Server before 1.8.1
Source GCVE Database
Not known to be exploited · CVSS 8.7 High : upgrade to 3.1.7 or 3.0.33 soon.
Data as of 13 Nov 2026, 13:46 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 8.7 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 8.8 |
- Patch
- Available – fixed in 3.1.7, 3.0.33, 1.8.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 13 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.
What to do
Upgrade Maverick to 3.1.7 or 3.0.33 (Synergy Server); 1.8.1 (Legacy Server).
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| JadaptiveMaverick Synergy Server | Affected
| Fixed in
|
| JadaptiveMaverick Synergy Server | Affected
| Fixed in
|
| JadaptiveMaverick Legacy Server | Affected
| Fixed in
|
MavenMaverick Synergy Serverpkg:maven/Maverick Synergy ServerOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
If you cannot patch yet, restrict SSH key usage and monitor for unusual authentication behavior. Avoid sharing SSH keys across multiple accounts and consider disabling public key authentication if feasible as a temporary mitigation.
Description
Jadaptive Maverick Synergy Server versions before 3.0.33 and 3.1.x before 3.1.7, as well as Maverick Legacy Server before 1.8.1, have an authentication bypass vulnerability in SSH public key authentication. This flaw allows attackers with a key authorized for one account to authenticate and then switch usernames on the same connection to gain access to other accounts without proper authorization.
References
- nvd.nist.gov/vuln/detail/CVE-2026-127090 (opens in a new tab)
- github.com/sshtools/maverick-synergy/commit/f7d23182cce985e21048215e96395881295cb0bd (opens in a new tab)
- github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-base/src/main/java/com/sshtools/common/auth/PublicKeyAuthentication.java (opens in a new tab)
- github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-synergy-server/src/main/java/com/sshtools/server/AuthenticationProtocolServer.java (opens in a new tab)
- jadaptive.com/security/advisories/JADAPTIVE-SA-2026-001 (opens in a new tab)
- store.jadaptive.com/app/api/releases/changes/01d04a39-0f05-4bae-842e-d2f1acc16985 (opens in a new tab)
- store.jadaptive.com/app/api/releases/changes/ff71bdcf-a2a2-47e0-af5a-22e15af1dfa4 (opens in a new tab)
- 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 (opens in a new tab)