CVE-2026-76653: Missing Authentication in VPN Configuration Management in TP-Link TL-MR6400 and Archer MR600

Severity: medium (CVSS 5.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-10 · updated 2026-09-11
Weakness: CWE-126

Description

A missing authentication vulnerability in the VPN configuration management has been identified in Archer MR600 (v2, v3 & v5) and TL-MR6400 v8 due to improper access control; a remote unauthenticated attacker may be able to access and modify VPN configuration information without valid credentials. Successful exploitation may allow a remote unauthenticated attacker to disclose and modify VPN configuration information.

Affected products

TP-Link Systems Inc. Archer MR600: from v3 before MR600(EU)_V3_1.4.0 Build 260827; from v2 before MR600(EU)_V2_1.12.0 Build 2600826 — fixed in MR600(EU)_V2_1.12.0 Build 2600826, MR600(EU)_V3_1.4.0 Build 260827
TP-Link Systems Inc. TL-MR6400 v8: before 1.5.0 0.9.1 v0001.0 Build 260610 Rel.67978n — fixed in 1.5.0 0.9.1 v0001.0 Build 260610 Rel.67978n

How to fix

Upgrade to a fixed version: TP-Link Systems Inc. Archer MR600 MR600(EU)_V2_1.12.0 Build 2600826, MR600(EU)_V3_1.4.0 Build 260827; TP-Link Systems Inc. TL-MR6400 v8 1.5.0 0.9.1 v0001.0 Build 260610 Rel.67978n. Check the vendor advisory for mitigations.

References

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