CVE-2026-121618— Linksys E5600 Factory Quality Control fqc.cgi information disclosure

Quick assessment

Affected

Linksys E5600

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linksys E5600（固件版本 1.1.0.26）中发现了一个安全漏洞。该漏洞影响“工厂质量控制”（Factory Quality Control）组件中的未知部分，具体涉及文件。通过操纵该文件可导致信息泄露。此攻击可被远程利用，且相关利用代码已公开，可能被用于实施攻击。厂商虽在漏洞披露初期即被联系，但至今未作任何回应。该漏洞仅影响已不再由维护方提供支持的产品。

CVSS 5.3 · Medium Updated Nov 04, 2026

Possible ATT&CK Techniques 2 AI

T1040 · Network Sniffing T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Linksys E5600 Factory Quality Control fqc.cgi information disclosure

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

信息暴露

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linksys	E5600	1.1.0.26	`cpe:2.3:o:linksys:e5600_firmware::::::::`

II. Public POCs for CVE-2026-121618

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-121618

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Other References for CVE-2026-121618 (5)

https://github.com/Zimo-666/E5600-cves/tree/main/05-fqc-info-disclosure exploit
https://vuldb.com/cve/CVE-2026-121618 third-party-advisory
https://vuldb.com/vuln/430466/cti signature permissions-required
https://vuldb.com/submit/1023314 third-party-advisory
https://vuldb.com/vuln/430466 vdb-entry

https://www.cve.org/CVERecord?id=CVE-2026-121618

Same Patch Batch · Linksys · 2026-11-04 · 4 CVEs total

CVE-2026-121615	10.0 CRITICAL	Linksys E5600 Login mesh_login.cgi improper authentication
CVE-2026-121617	7.5 HIGH	Linksys E5600 Header upload_fw.cgi init_multipart out-of-bounds write
CVE-2026-121616	5.3 MEDIUM	Linksys E5600 JSON Request mesh_login.cgi strcpy out-of-bounds write

IV. Related Vulnerabilities

Same product: E5600

Same vendor: Linksys

Same weakness: CWE-200