CVE-2026-3040
DrayTek Vigor 300B Web Management uploadlangs cgiGetFile os command injection
Description
A vulnerability was identified in DrayTek Vigor 300B up to 1.5.1.6. This affects the function cgiGetFile of the file /cgi-bin/mainfunction.cgi/uploadlangs of the component Web Management Interface. The manipulation of the argument File leads to os command injection. The attack may be initiated remotely. The exploit is publicly available and might be used. The vendor confirms that "300B is EoL, and this is an authenticated vulnerability. We don't plan to fix it." This vulnerability only affects products that are no longer supported by the maintainer.
INFO
Published Date :
Feb. 23, 2026, 10:16 p.m.
Last Modified :
Feb. 26, 2026, 4:11 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-3040
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Replace the EoL product with a supported alternative.
- Ensure all installed products are actively maintained.
- Monitor vendor advisories for supported products.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3040.
| URL | Resource |
|---|---|
| https://github.com/master-abc/cve/issues/42 | Exploit Issue Tracking |
| https://vuldb.com/?ctiid.347394 | Permissions Required Third Party Advisory VDB Entry |
| https://vuldb.com/?id.347394 | Third Party Advisory VDB Entry |
| https://vuldb.com/?submit.757126 | Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3040 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3040
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3040 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3040 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 26, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-78 Added CPE Configuration AND OR *cpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.5.1.6 OR cpe:2.3:h:draytek:vigor300b:-:*:*:*:*:*:*:* Added Reference Type VulDB: https://github.com/master-abc/cve/issues/42 Types: Exploit, Issue Tracking Added Reference Type VulDB: https://vuldb.com/?ctiid.347394 Types: Permissions Required, Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.347394 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.757126 Types: Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Feb. 23, 2026
Action Type Old Value New Value Added Tag unsupported-when-assigned Added Description A vulnerability was identified in DrayTek Vigor 300B up to 1.5.1.6. This affects the function cgiGetFile of the file /cgi-bin/mainfunction.cgi/uploadlangs of the component Web Management Interface. The manipulation of the argument File leads to os command injection. The attack may be initiated remotely. The exploit is publicly available and might be used. The vendor confirms that "300B is EoL, and this is an authenticated vulnerability. We don't plan to fix it." This vulnerability only affects products that are no longer supported by the maintainer. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/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 Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L Added CVSS V2 (AV:N/AC:L/Au:M/C:P/I:P/A:P) Added CWE CWE-78 Added CWE CWE-77 Added Reference https://github.com/master-abc/cve/issues/42 Added Reference https://vuldb.com/?ctiid.347394 Added Reference https://vuldb.com/?id.347394 Added Reference https://vuldb.com/?submit.757126