What’s Vulnerable › Vulnerabilities

CVE-2026-12339: Authenticated Arbitrary File Write Vulnerability in multiple devices

• Severity: medium (CVSS 6.9 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: 2026-08-10 · updated 2026-10-23
• Weakness: CWE-22

Description

A Zip Slip vulnerability in the WebUI ISP Upgrade functionality allows arbitrary file write via a crafted archive containing directory traversal sequences. An authenticated administrator may overwrite arbitrary files on the system.Successful exploitation may allow arbitrary file to be overwritten on the underlying system, affecting system integrity and availability.

Affected products

• TP-Link Systems Inc. Archer MR200 v7: before (EU)_1.3.0 0.9.1 v0001.0 Build 260605 Rel.57870n — fixed in (EU)_1.3.0 0.9.1 v0001.0 Build 260605 Rel.57870n
• TP-Link Systems Inc. Archer MR600 v2: before (EU)_1.10.0 0.9.1 v0001.0 Build 260618 RC.40417n — fixed in (EU)_1.10.0 0.9.1 v0001.0 Build 260618 RC.40417n
• TP-Link Systems Inc. TL-MR100 v3.20: before (EU)_1.3.0 0.9.1 v0001.0 Build 260609 Rel.49957n; before 1.1.0 0.9.1 v0001.0 Build 260609 Rel35479n,  Customized Software for South Korea KT; before 1.2.0 0.9.1 v0001.0 Build 260609 Rel.36250n, Customized Software for South Korea Telenor — fixed in Customized Software for South Korea Telenor,  Customized Software for South Korea KT, (EU)_1.3.0 0.9.1 v0001.0 Build 260609 Rel.49957n, 1.1.0 0.9.1 v0001.0 Build 260609 Rel35479n, 1.2.0 0.9.1 v0001.0 Build 260609 Rel.36250n
• TP-Link Systems Inc. TL-MR150 v3.20: before (EU)_1.3.0 0.9.1 v0001.0 Build 260720 Rel.59727n — fixed in (EU)_1.3.0 0.9.1 v0001.0 Build 260720 Rel.59727n
• TP-Link Systems Inc. TL-MR6400 v5.3: before (EU)_1.10.0 0.9.1 v0001.0 Build 260613 RC.76099n — fixed in (EU)_1.10.0 0.9.1 v0001.0 Build 260613 RC.76099n
• TP-Link Systems Inc. TL-MR6400 v8.0: before (EU)_1.5.0 0.9.1 v0001.0 Build 260610 Rel.67978n — fixed in (EU)_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 MR200 v7 (EU)_1.3.0 0.9.1 v0001.0 Build 260605 Rel.57870n; TP-Link Systems Inc. Archer MR600 v2 (EU)_1.10.0 0.9.1 v0001.0 Build 260618 RC.40417n; TP-Link Systems Inc. TL-MR100 v3.20 Customized Software for South Korea Telenor,  Customized Software for South Korea KT, (EU)_1.3.0 0.9.1 v0001.0 Build 260609 Rel.49957n, 1.1.0 0.9.1 v0001.0 Build 260609 Rel35479n; TP-Link Systems Inc. TL-MR150 v3.20 (EU)_1.3.0 0.9.1 v0001.0 Build 260720 Rel.59727n; TP-Link Systems Inc. TL-MR6400 v5.3 (EU)_1.10.0 0.9.1 v0001.0 Build 260613 RC.76099n; TP-Link Systems Inc. TL-MR6400 v8.0 (EU)_1.5.0 0.9.1 v0001.0 Build 260610 Rel.67978n. Check the vendor advisory for mitigations.

References

• https://www.tp-link.com/en/support/download/archer-mr200/v7/#Firmware
• https://www.tp-link.com/en/support/download/archer-mr600/v2/#Firmware
• https://www.tp-link.com/en/support/download/tl-mr100/v3.20/#Firmware
• https://www.tp-link.com/en/support/download/tl-mr150/v3.20/#Firmware
• https://www.tp-link.com/en/support/download/tl-mr6400/v5.30/#Firmware
• https://www.tp-link.com/en/support/download/tl-mr6400/v8/#Firmware
• https://www.tp-link.com/en/support/faq/5237/
• https://www.tp-link.com/kr/support/download/tl-mr100/v3.20/#Firmware

Get alerted when CVE-2026-12339 or the next vulnerability affects your stack