# CVE-2026-126777: Traccar 3.15 before 6.17.0 Authentication Bypass via Empty LDAP Password

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/traccar/traccar/commit/552c31f2097dbed9edef7cfe174c50b16febdc21

## Affected products and versions

- Traccar / Traccar (traccar/traccar): ≥ 3.15; < 6.17.0 (affected, custom); 6.17.0 (unaffected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.1 (critical); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-287

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/traccar/traccar/commit/552c31f2097dbed9edef7cfe174c50b16febdc21 (CNA: VulnCheck; patch)

- https://github.com/traccar/traccar/releases/tag/v6.17.0 (CNA: VulnCheck; release-notes)

- https://github.com/traccar/traccar/blob/v6.16.0/src/main/java/org/traccar/database/LdapProvider.java#L171-L176 (CNA: VulnCheck; technical-description)

- https://github.com/traccar/traccar/blob/v3.15/src/org/traccar/database/LdapProvider.java#L163-L169 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/traccar-3.15-before-6.17.0-authentication-bypass-via-empty-ldap-password (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126777; retrieved 2026-11-11; source updated 2026-11-11

Revision: 5a94bbf69967adbcac61490bb99a184f745b23f5b8730a2e11350d4869f377c6

Canonical: https://y2.dev/cve/CVE-2026-126777

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.