CVE-2026-126777: Auth Bypass (CVSS 7.4)

Description

Traccar 3.15 before 6.17.0 contains an authentication bypass vulnerability in LdapProvider.login() that fails to reject empty passwords, causing LDAP binds to be performed as unauthenticated binds when LDAP authentication is enabled. Unauthenticated attackers who know a valid username can log in via POST /api/session or HTTP Basic authentication with an empty password against directories that permit unauthenticated binds, obtaining sessions for any account including administrators.

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CVSS v3.1 Score

7.4

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0046

Probability of exploitation

0.41%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-287 Improper Authentication

References

Other References

https://github.com/traccar/traccar/blob/v3.15/src/org/traccar/database/LdapProvider.java#L163-L169 https://github.com/traccar/traccar/blob/v6.16.0/src/main/java/org/traccar/database/LdapProvider.java#L171-L176 https://github.com/traccar/traccar/commit/552c31f2097dbed9edef7cfe174c50b16febdc21 https://github.com/traccar/traccar/releases/tag/v6.17.0 https://www.vulncheck.com/advisories/traccar-3.15-before-6.17.0-authentication-bypass-via-empty-ldap-password

Frequently Asked Questions

What is CVE-2026-126777? +

Traccar 3.15 before 6.17.0 contains an authentication bypass vulnerability in LdapProvider.login() that fails to reject empty passwords, causing LDAP binds to be performed as unauthenticated binds when LDAP authentication is enabled. Unauthenticated attackers who know a valid username can log in via POST /api/session or HTTP Basic authentication with an empty password against directories that permit unauthenticated binds, obtaining sessions for any account including administrators. It has a CVSS v3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-126777? +

CVE-2026-126777 has a CVSS v3.1 score of 7.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-126777? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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