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CVE-2026-12339

MEDIUMCVSS 6.9/10EPSS 0.31%

Last modified

CVE-2026-12339 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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 overwrite on the underlying system, affecting system integrity and availability.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

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 overwrite on the underlying system, affecting system integrity and availability.

Metrics

CVSS 4.0
6.9/10

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

EPSS Probability
0.31%

23.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
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

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-12339?
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 overwrite on the underlying system, affecting system integrity and availability.
How severe is CVE-2026-12339?
CVE-2026-12339 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2026-12339?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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Source: NVD / NIST