What is CVE-2026-118579?

CVE-2026-118579 is a critical-severity vulnerability in D-Link Dir-505, classified under Hidden Functionality. CVSS score: 9.8/10. Published 2026-10-28.

How severe is CVE-2026-118579?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in D-Link Dir-505

CVE-2026-118579

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.

Published 2026-10-28.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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

D-Link Dir-505 — versions 1.10B02

Weakness classification (CWE)

CWE-912 — Hidden Functionality

References

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

Frequently asked questions

What is CVE-2026-118579?: CVE-2026-118579 is a critical-severity vulnerability in D-Link Dir-505, classified under Hidden Functionality. CVSS score: 9.8/10. Published 2026-10-28.
How severe is CVE-2026-118579?: Critical severity. CVSS v3 base score is 9.8 out of 10.