The CVE record says the provider fails to reject an empty password before asking an LDAP directory to authenticate the user.When LDAP authentication is enabled and the directory permits unauthenticated binds, a person who knows a valid username may obtain a Traccar session. The record says this can include administrator accounts.
What it allows
How Does CVE-2026-126777 Bypass Authentication?
Traccar’s LDAP login provider does not reject an empty password. According to the CVE record, an LDAP bind can then be treated as unauthenticated when the directory accepts that bind mode.
The attacker must know a valid Traccar username. If the LDAP and directory conditions are both present, the record says a login can create a session without the account’s password, including for an administrator.
The issue is a conditional authentication failure, rather than a universal Traccar login bypass. Administrators should verify both the Traccar authentication setting and the directory’s bind behavior before judging exposure.
What Is Known About Exploitation?
CISA KEV catalog version 2026.11.10 did not list CVE-2026-126777. This dated catalog status does not determine whether any other exploitation has occurred.
Who is affected
Which Traccar Versions Are Affected?
The CNA lists Traccar versions from 3.15 up to, but excluding, 6.17.0 as affected. It lists 6.17.0 as unaffected. The record does not establish exposure for versions before 3.15.
Exposure also requires LDAP authentication to be enabled and the connected directory to permit unauthenticated binds. Affected version numbers alone do not establish that an installation meets those conditions.
How Should Teams Prioritize This Risk?
The CNA scores the issue 9.1 Critical under CVSS 4.0 and 7.4 High under CVSS 3.1. Its CVSS 4.0 vector marks attack requirements as present, reflecting the LDAP directory condition described in the record.
Our assessment is to prioritize installations where LDAP is enabled and directory bind policy permits unauthenticated binds. Review administrator accounts first because the CVE record says those accounts can also receive sessions under the stated conditions.
What Should Defenders Do?
Upgrade affected Traccar installations to 6.17.0 or a later fixed release. Verify the installed version and confirm the authentication configuration after the change.
As a Brandefense precaution, review the directory policy for unauthenticated binds and check Traccar authentication logs for unexpected sessions tied to valid usernames. Investigate suspicious administrator sessions through the organization’s normal incident process.
Use the vulnerability management guide to coordinate the update. The vulnerability prioritization glossary explains exposure-based triage, while the vulnerability management glossary covers the wider process.
Timeline
- 2026-10-31
VulnCheck CNA dates the vulnerability’s public disclosure.
- 2026-11-11
The CVE record was published and NVD published its entry.
What to do
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Identify LDAP-enabled Traccar installations
Inventory Traccar versions from 3.15 through releases before 6.17.0. Confirm whether LDAP authentication is enabled.
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Check directory bind policy
Determine whether the connected LDAP directory permits unauthenticated binds. Treat that setting as an exposure condition.
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Update Traccar
Upgrade affected installations to 6.17.0 or a later fixed release and verify the installed version.
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Review authentication activity
As a Brandefense precaution, investigate unexpected sessions, especially administrator sessions, around affected installations.
What Brandefense can do
- Scan your domain in Brandefense Atlas, free
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- Vulnerability intelligence platform
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Frequently Asked Questions
What is CVE-2026-126777?
It is a conditional authentication bypass in Traccar’s LDAP login provider. Empty passwords are not rejected before an LDAP bind.
Does every Traccar installation face the same exposure?
No. The CVE record requires LDAP authentication to be enabled and the connected directory to permit unauthenticated binds.
Which version fixes CVE-2026-126777?
The CNA lists Traccar 6.17.0 as unaffected. It lists versions from 3.15 up to, but excluding, 6.17.0 as affected.
Can administrator accounts be affected?
Yes. Under the stated LDAP conditions, the CVE record says a valid administrator username can obtain a session with an empty password.
Is CVE-2026-126777 in CISA KEV?
It was not listed in CISA KEV catalog version 2026.11.10. That dated catalog status does not establish exploitation status elsewhere.
Sources
- CVE-2026-126777 RecordVulnCheck CNA via CVE Program
- CVE-2026-126777 DetailNational Vulnerability Database
- Known Exploited Vulnerabilities CatalogCybersecurity and Infrastructure Security Agency
