Critical 9.8Published Oct 28, 2026

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

Updated under an hour ago (Oct 29, 2026, 10:00 PM ET)

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It affects D-Link DIR-505. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.79%, higher than 56% of scored CVEs.

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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.

CVSS: 9.8 CRITICAL (v3.1, CNA)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
Weakness (CWE): CWE-912
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.79% (percentile 56)
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Oct 29, 2026
First seen by InfoSec Signals: Oct 28, 2026

Affected products

Affected products

D-Link DIR-505 d-link:dir-505	1.10B02	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.