CVE-2026-118579— D-Link DIR-505 Web Management CGI secmark1524.cgi main backdoor

Quick assessment

Affected

D-Link DIR-505

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 D-Link DIR-505 固件版本 1.10B02 中发现一处安全漏洞。受影响组件为 Web 管理 CGI 中的文件，具体涉及其函数。攻击者可通过操纵该函数的参数（包括、、、和）植入后门。此漏洞可被远程利用，且相关利用代码已公开，可能被用于发起攻击。

CVSS 9.8 · Critical Updated Oct 29, 2026

Possible ATT&CK Techniques 3 AI

T1569 · System Services T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

D-Link DIR-505 Web Management CGI secmark1524.cgi main backdoor

Source: CVE Program / CVE List V5

Vulnerability Description

A weakness has been identified in D-Link DIR-505 1.10B02. The impacted element is the function main of the file /secmark1524.cgi of the component Web Management CGI. This manipulation of the argument accu/pass/code/hash/cmds causes backdoor. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

隐藏功能

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
D-Link	DIR-505	1.10B02	`cpe:2.3:h:d-link:dir-505::::::::`

II. Public POCs for CVE-2026-118579

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-118579

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Vendor Pages for CVE-2026-118579 (1)

Smart Home, SMB and Enterprise solutions | D-Link product

Other References for CVE-2026-118579 (5)

https://github.com/Walnut1337/DIR-505_backdoor/tree/main/poc exploit
https://vuldb.com/cve/CVE-2026-118579 third-party-advisory
https://vuldb.com/vuln/428018/cti signature permissions-required
https://vuldb.com/submit/1025351 third-party-advisory
https://vuldb.com/vuln/428018 vdb-entry technical-description

https://www.cve.org/CVERecord?id=CVE-2026-118579

IV. Related Vulnerabilities

Same vendor: D-Link

Same weakness: CWE-912