CVE-2026-5311D-Link DNS-1550-04 file_center.cgi Webdav_Access_List access control

6.9MediumCVSS base score
1.0%Exploitation in 30 daysEPSS · top 36% of all CVEs
NoKnown exploitednot in CISA's KEV catalog
YesPublic exploitsa reference or SSVC says so

Description

A security flaw has been discovered in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05 and DNS-1550-04 up to 20260205. Affected is the function Webdav_Access_List of the file /cgi-bin/file_center.cgi. Performing a manipulation of the argument cmd results in improper access controls. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.

Show the exploits1

References tagged exploit1 reference

https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_171/171.md (opens in a new tab)exploit

Timeline

2026
1 Apr 2026
1 Apr 2026
ID reserved
By VulDB
1 Apr 2026
1 Apr 2026
Published
2 Apr 20261 day later
2 Apr 2026· 1 day later
Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-5311, by who scored it
Scored by	CVSS	Score	Vector
VulDBCNA (assigner)	4.0	Medium6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
VulDBCNA (assigner)	3.1	Medium5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R
VulDBCNA (assigner)	3.0	Medium5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R
VulDBCNA (assigner)	2.0	Medium5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N/E:POC/RL:ND/RC:UR
NVDNVD · Analyzed	4.0	Medium5.5	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS (exploitation in 30 days): 1.0% · top 36% of all CVEs (15 Nov 2026)
CISA SSVC: Exploitation: poc · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.9.

Affected products

D-Link · DNS-120
- affected 20260205
D-Link · DNR-202L
- affected 20260205
D-Link · DNS-315L
- affected 20260205
D-Link · DNS-320
- affected 20260205
D-Link · DNS-320L
- affected 20260205
D-Link · DNS-320LW
- affected 20260205
D-Link · DNS-321
- affected 20260205
D-Link · DNR-322L
- affected 20260205
D-Link · DNS-323
- affected 20260205
D-Link · DNS-325
- affected 20260205
D-Link · DNS-326
- affected 20260205
D-Link · DNS-327L
- affected 20260205
D-Link · DNR-326
- affected 20260205
D-Link · DNS-340L
- affected 20260205
D-Link · DNS-343
- affected 20260205
D-Link · DNS-345
- affected 20260205
D-Link · DNS-726-4
- affected 20260205
D-Link · DNS-1100-4
- affected 20260205
D-Link · DNS-1200-05
- affected 20260205
D-Link · DNS-1550-04
- affected 20260205

References5

VDB-354640 | D-Link DNS-1550-04 file_center.cgi Webdav_Access_List access control (opens in a new tab)vdb-entrytechnical-description
VDB-354640 | CTI Indicators (IOB, IOC, TTP, IOA) (opens in a new tab)signaturepermissions-required
Submit #780441 | D-Link DNS-120/202L/315L/320/320L/320LW/321/322L/323/325/326/327L/326/340L/343/345/726-4/1100-4/1200-05/1550-04 up to 20260205 Improper Access Controls (opens in a new tab)third-party-advisory
https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_171/171.md (opens in a new tab)exploit
https://www.dlink.com/ (opens in a new tab)product

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

[![CVE-2026-5311](https://cveledger.app/badge/CVE-2026-5311.svg)](https://cveledger.app/cve/CVE-2026-5311)

Record last updated 2 Apr 2026, 15:27 UTC.