Information disclosure in Linksys E5600
CVE-2026-121618
A weakness has been identified in Linksys E5600 1.1.0.26. This affects an unknown part of the file /cgi-bin/fqc.cgi of the component Factory Quality Control. This manipulation causes information disclosure. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks. 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: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
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
- github.com/Zimo-666/E5600-cves/tree/main/05-fqc-info-disclosure (exploit)
- vuldb.com/cve/CVE-2026-121618 (third-party-advisory)
- vuldb.com/submit/1023314 (third-party-advisory)
- vuldb.com/vuln/430466 (vdb-entry)
- vuldb.com/vuln/430466/cti (signature, permissions-required)
- www.linksys.com/ (product)
Frequently asked questions
- What is CVE-2026-121618?
- CVE-2026-121618 is a medium-severity vulnerability in Linksys E5600, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-11-04.
- How severe is CVE-2026-121618?
- Medium severity. CVSS v3 base score is 5.3 out of 10.