CyberSecBulletin
CVE-2026-127090NVD status: Awaiting Analysis

Maverick Synergy Server: Authentication Bypass by Primary Weakness

Published Updated By the CyberSecBulletin desk

CVE-2026-127090 is a high-severity authentication bypass by primary weakness vulnerability in Maverick Synergy Server from Jadaptive, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions 3.0.33, 3.1.7 as the first without the flaw, so updating Maverick Synergy Server to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.6% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Maverick Synergy Server to 3.0.33 or 3.1.7, whichever matches your release line, or a later version.
  2. Update Maverick Legacy Server to 1.8.1 or a later version.
  3. Read the advisory on jadaptive.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
JadaptiveMaverick Synergy Serverbefore 3.0.33; 3.1.0 up to, but not including, 3.1.73.0.33, 3.1.7
JadaptiveMaverick Legacy Serverbefore 1.8.11.8.1

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (vulncheck.com).

Scoring systemScoreSeverityScored by
CVSS 4.08.7HighCNA (vulncheck.com)
CVSS 3.18.8HighCNA (vulncheck.com)

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Authentication Bypass by Primary Weakness

The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

More Authentication Bypass by Primary Weakness vulnerabilities (CWE-305)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).

References

Recent Authentication Bypass by Primary Weakness vulnerabilities

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