CVE-2026-121618 Details
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.
A vulnerability allowing information disclosure has been identified in the Linksys E5600 router, specifically in the firmware version 1.1.0.26. The issue resides in the Factory Quality Control component, within the file '/cgi-bin/fqc.cgi'. This vulnerability arises because the 'fqc.cgi' script is listed in the web server's authentication exception, allowing unauthenticated users to access sensitive device information. The exposed data includes the device's serial number, MAC addresses, WiFi ESSIDs, default WiFi passphrase, default WPS PIN, firmware version, region, and boot mode. The vulnerability can be exploited remotely, and a public exploit is available.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Zimo-666/E5600-cves/tree/main/05-fqc-info-disclosure | [email protected] | ExploitTechnical Description |
| https://vuldb.com/cve/CVE-2026-121618 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1023314 | [email protected] | Permission Required |
| https://vuldb.com/vuln/430466 | [email protected] | Permission Required |
| https://vuldb.com/vuln/430466/cti | [email protected] | Content Wall |
| https://www.linksys.com/ | [email protected] | Vendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | [email protected] |
| CWE-284 | Improper Access Control | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Linksys E5600 | 1.1.0.26 |
CPE
Remediation
| |
Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | New CVE Received | [email protected] |