CVE-2026-11409
OS Command Injection in IPv6 PPPoE Configuration in TP-Link TL-WR940N
Description
An authenticated OS command injection vulnerability exists in the IPv6 PPPoE configuration handler in TL-WR940N v6 due to improper sanitization of user input. An attacker with administrative access may exploit this issue to execute arbitrary system commands with elevated privileges.
INFO
Published Date :
June 17, 2026, 1:19 p.m.
Last Modified :
June 18, 2026, 6:50 p.m.
Remotely Exploit :
No
Source :
f23511db-6c3e-4e32-a477-6aa17d310630
Affected Products
The following products are affected by CVE-2026-11409
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 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 | ||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 |
Solution
- Update router firmware to the latest version.
- Sanitize all user inputs in the configuration handler.
- Restrict administrative access to trusted users only.
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-2026-11409.
| URL | Resource |
|---|---|
| https://www.tp-link.com/en/support/download/tl-wr940n/v6/#Firmware | Product |
| https://www.tp-link.com/us/support/download/tl-wr940n/v6/#Firmware | Product |
| https://www.tp-link.com/us/support/faq/5131/ | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-11409 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-2026-11409
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-2026-11409 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-11409 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]
Jun. 18, 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 CPE Configuration AND OR *cpe:2.3:o:tp-link:tl-wr940n_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 260528 OR cpe:2.3:h:tp-link:tl-wr940n:v6:*:*:*:*:*:*:* Added Reference Type TPLink: https://www.tp-link.com/en/support/download/tl-wr940n/v6/#Firmware Types: Product Added Reference Type TPLink: https://www.tp-link.com/us/support/download/tl-wr940n/v6/#Firmware Types: Product Added Reference Type TPLink: https://www.tp-link.com/us/support/faq/5131/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 18, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-11409', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-17T14:35:22.183287Z'} {'id': 'CVE-2026-11409', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-17T00:00:00+00:00'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-11409', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-17T14:35:22.183287Z'} -
New CVE Received by f23511db-6c3e-4e32-a477-6aa17d310630
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'TP-Link Systems Inc.', 'product': 'TL-WR940N v6', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': 'V6_260528', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] Added Description An authenticated OS command injection vulnerability exists in the IPv6 PPPoE configuration handler in TL-WR940N v6 due to improper sanitization of user input. An attacker with administrative access may exploit this issue to execute arbitrary system commands with elevated privileges. Added CVSS V4.0 AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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 CWE CWE-78 Added Reference https://www.tp-link.com/en/support/download/tl-wr940n/v6/#Firmware Added Reference https://www.tp-link.com/us/support/download/tl-wr940n/v6/#Firmware Added Reference https://www.tp-link.com/us/support/faq/5131/