Auth bypass in Linksys E5600
CVE-2026-121615
A vulnerability was determined in Linksys E5600 1.1.0.26. Affected is an unknown function of the file /cgi-bin/mesh_login.cgi of the component Login Handler. Executing a manipulation can lead to improper authentication. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Linksys E5600 — versions 1.1.0.26
Weakness classification (CWE)
References
- vuldb.com/vuln/430463 (vdb-entry)
- vuldb.com/vuln/430463/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-121615 (third-party-advisory)
- vuldb.com/submit/1023310 (third-party-advisory)
- github.com/Zimo-666/E5600-cves/tree/main/02-mesh-login-auth-bypass (exploit)
- www.linksys.com/ (product)
Frequently asked questions
- What is CVE-2026-121615?
- CVE-2026-121615 is a critical-severity vulnerability in Linksys E5600, classified under Improper Authentication. CVSS score: 10.0/10. Published 2026-11-04.
- How severe is CVE-2026-121615?
- Critical severity. CVSS v3 base score is 10.0 out of 10.