CVE-2026-12339 json
Authenticated Arbitrary File Write Vulnerability in multiple devices
published 2026-08-10 2 mo ago modified 2026-10-23 16 d ago also EUVD-2026-55700
- cvss
- 6.9
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- 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. Archer MR600 v2 (EU)_1.10.0 0.9.1 v0001.0 Build 260618 RC.40417n
- TP-Link Systems Inc. Archer MR200 v7 (EU)_1.3.0 0.9.1 v0001.0 Build 260605 Rel.57870n
- TP-Link Systems Inc. TL-MR6400 v8.0 (EU)_1.5.0 0.9.1 v0001.0 Build 260610 Rel.67978n
- 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-MR100 v3.20 (EU)_1.3.0 0.9.1 v0001.0 Build 260609 Rel.49957n, 1.1.0 0.9.1 v0001.0 Build 260609 Rel35479n, Customized Software for South Korea KT, 1.2.0 0.9.1 v0001.0 Build 260609 Rel.36250n, Customized Software for South Korea Telenor
- tp-link.com/en/support/download/tl-mr6400/v5.30/#Firmware patch
- tp-link.com/en/support/download/archer-mr600/v2/#Firmware patch
- tp-link.com/en/support/download/archer-mr200/v7/#Firmware patch
- tp-link.com/en/support/download/tl-mr100/v3.20/#Firmware patch
- tp-link.com/en/support/download/tl-mr150/v3.20/#Firmware patch
- tp-link.com/en/support/download/tl-mr6400/v8/#Firmware patch
- tp-link.com/kr/support/download/tl-mr100/v3.20/#Firmware patch
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/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 |
Affected products
- TP-Link Systems Inc. TL-MR6400 v5.3
- TP-Link Systems Inc. Archer MR600 v2
- TP-Link Systems Inc. Archer MR200 v7
- TP-Link Systems Inc. TL-MR6400 v8.0
- TP-Link Systems Inc. TL-MR150 v3.20
- TP-Link Systems Inc. TL-MR100 v3.20
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
tp-link.com
/en/support/download/tl-mr6400/v5.30/#Firmware
patch
-
tp-link.com
/en/support/download/archer-mr600/v2/#Firmware
patch
-
tp-link.com
/en/support/download/archer-mr200/v7/#Firmware
patch
-
tp-link.com
/en/support/download/tl-mr100/v3.20/#Firmware
patch
-
tp-link.com
/en/support/download/tl-mr150/v3.20/#Firmware
patch
-
tp-link.com
/en/support/download/tl-mr6400/v8/#Firmware
patch
-
tp-link.com
/kr/support/download/tl-mr100/v3.20/#Firmware
patch
-
tp-link.com
/en/support/faq/5237/
vendor-advisory
Sources
- CVE List CVE-2026-12339
- NVD CVE-2026-12339
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.