Vulnerability · Published Oct 28, 2026 · Assigned by VulDB

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

Critical 9.8

In plain English

A critical-severity security flaw in DIR-505 from D-Link. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.8%top 43.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
D-Link	DIR-505	1.10B02

Weakness: CWE-912 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-428018 | D-Link DIR-505 Web Management CGI secmark1524.cgi main backdoor vdb-entry, technical-description
VDB-428018 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-118579 | CVE Analysis and Report third-party-advisory
Submit #1025351 | D-Link DIR-505 1.10B02 Backdoor third-party-advisory
https://github.com/Walnut1337/DIR-505_backdoor/tree/main/poc exploit
https://www.dlink.com/ product