CVE-2026-11409: An authenticated OS command injection vulnerability exists in the IPv6 PPPoE configuration handler in TL-WR940

Q: How do I fix CVE-2026-11409?

tl-wr940n firmware: upgrade to 260528. Exact commands for each OS are on this page.

Q: Is CVE-2026-11409 being exploited?

CVE-2026-11409 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-11409 affect?

CVE-2026-11409 affects tl-wr940n firmware. Severity is high (CVSS 7.2). 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 arbitrar

This month

HIGH 7.2UPGRADE

CVE-2026-11409 is a high-severity flaw (CVSS 7.2) affecting tl-wr940n firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-06-17
Last modified	2026-10-26

Publisher (CNA): TPLink · Vendor: tp-link

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 13:19 UTCPublished CVE record published
2026-10-26 12:10 UTCUpdated Record last modified

tp-link tl-wr940n firmware UPGRADE

Affected: < 260528

Fixed in: 260528

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-11409?

tl-wr940n firmware: upgrade to 260528. Exact commands for each OS are on this page.

Is CVE-2026-11409 being exploited?

CVE-2026-11409 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-11409 affect?

CVE-2026-11409 affects tl-wr940n firmware. Severity is high (CVSS 7.2). 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 arbitrar

How urgent is CVE-2026-11409?

Priority 47/100. High severity

Software pages

TP-Link vulnerabilities

Related CVEs

CVE-2026-11410 HIGH 7.2 UPGRADE An authenticated OS command injection vulnerability exists in the BigPond Cable (BPA) WAN configuration module

References

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