# CVE-2026-118579: D-Link DIR-505 authentication bypass in web management

Source: https://junglewise.ai/threats/cve-2026-118579-a-weakness-has-been-identified-in-d-link-dir-505-1-10b02-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-118579 · Severity: critical · CVSS 9.8 · Published 2026-10-28

D-Link DIR-505 is a wireless router used to provide network connectivity to homes and offices. A flaw in the web-based management interface allows remote attackers to bypass authentication and gain full control of the device by manipulating parameters in the /secmark1524.cgi file. This enables attackers to reconfigure the router, intercept traffic, or use it as a foothold for further network attacks.

Vendors: [D-Link](https://junglewise.ai/threats/vendors/d-link).

## Quick answers

**Is CVE-2026-118579 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-118579 being exploited in the wild.

**How severe is CVE-2026-118579?** Critical severity, with a CVSS score of 9.8, published 28 October 2026.

**Which products and versions are affected?** D-Link DIR-505 1.10B02.

**Is there a fix for CVE-2026-118579?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-118579 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-118579?** Check whether you run D-Link DIR-505 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A backdoor vulnerability exists in the web management CGI component of D-Link DIR-505 1.10B02, specifically in the /secmark1524.cgi file's main function. The vulnerability allows manipulation of arguments (accu, pass, code, hash, cmds) to bypass authentication controls and execute arbitrary commands. The attack requires only network access with no authentication or user interaction needed; a public exploit is available.

## Affected products

- D-Link DIR-505 1.10B02

## Timeline

- 2026-10-28: disclosed
- exploited: Public exploit code available

## References

- [https://github.com/Walnut1337/DIR-505_backdoor/tree/main/poc](https://github.com/Walnut1337/DIR-505_backdoor/tree/main/poc)
- [https://vuldb.com/cve/CVE-2026-118579](https://vuldb.com/cve/CVE-2026-118579)

## Related threats

- [D-Link DIR-505 stack-based buffer overflow in TFTP upload handler](https://junglewise.ai/threats/cve-2026-120189-a-vulnerability-was-identified-in-d-link-dir-505-1-10b02)