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TI-2026-02790 Aliases CVE-2026-3227GHSA-7vvh-gmhq-282v

Authenticated Command Injection on TP-Link TL-WR802N, TL-WR841N and TL-WR840N

Priority HIGH 72CWE-78Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

A command injection vulnerability was identified in TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 due to improper neutralization of special elements used in an OS command. In the router configuration import function allows an authenticated attacker to upload a crafted configuration file that results in execution of OS commands with root privileges during port-trigger processing. Successful exploitation allows an authenticated attacker to execute system commands with root privileges, leading to full device compromise.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01924 80th percentileScored 2026-11-07
Fix Fixed TL-WR802N v4 (TP-Link Systems Inc.): V4_260304TL-WR841N v14 (TP-Link Systems Inc.): V14_260303+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TP-LinkTL-WR802N v4before V4_260304V4_260304Patch availableCNA
TP-LinkTL-WR841N v14before V14_260303V14_260303Patch availableCNA
TP-LinkTL-WR840N v6before V6_260304V6_260304Patch availableCNA
  • TL-WR802N v4 VendorTP-Link Affected before V4_260304 Fixed in V4_260304 Patch available CNA
  • TL-WR841N v14 VendorTP-Link Affected before V14_260303 Fixed in V14_260303 Patch available CNA
  • TL-WR840N v6 VendorTP-Link Affected before V6_260304 Fixed in V6_260304 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:tp-link:tl-wr802n_firmware:*:*:*:*:*:*:*:*before 260304VulnerableTP-Link
cpe:2.3:h:tp-link:tl-wr802n:v4:*:*:*:*:*:*:*v4Running onTP-Link
cpe:2.3:o:tp-link:tl-wr841n_firmware:*:*:*:*:*:*:*:*before 260303VulnerableTP-Link
cpe:2.3:h:tp-link:tl-wr841n:14:*:*:*:*:*:*:*14Running onTP-Link
cpe:2.3:o:tp-link:tl-wr840n_firmware:*:*:*:*:*:*:*:*before 260304VulnerableTP-Link
cpe:2.3:h:tp-link:tl-wr840n:6:*:*:*:*:*:*:*6Running onTP-Link
  • cpe:2.3:o:tp-link:tl-wr802n_firmware:*:*:*:*:*:*:*:* Versions before 260304 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:tl-wr802n:v4:*:*:*:*:*:*:* Versions v4 Running on ·TP-Link
  • cpe:2.3:o:tp-link:tl-wr841n_firmware:*:*:*:*:*:*:*:* Versions before 260303 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:tl-wr841n:14:*:*:*:*:*:*:* Versions 14 Running on ·TP-Link
  • cpe:2.3:o:tp-link:tl-wr840n_firmware:*:*:*:*:*:*:*:* Versions before 260304 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:tl-wr840n:6:*:*:*:*:*:*:* Versions 6 Running on ·TP-Link

Remediation

  • Fix · CNA TL-WR802N v4 (TP-Link Systems Inc.) Fixed in V4_260304
  • Fix · CNA TL-WR841N v14 (TP-Link Systems Inc.) Fixed in V14_260303
  • Fix · CNA TL-WR840N v6 (TP Link Systems Inc.) Fixed in V6_260304

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-3227
  2. 2026-10-03 Alias added: GHSA-7vvh-gmhq-282v

References

Patch 5

Advisory 1

  • TI-2021-10089 TP-Link TL-WR802N(US), Archer_C50v5_US v4_200 <= 2020.06 contains a buffer overflow… CVSS 3.1HIGH 8.1
  • TI-2021-03018 TP-Link wifi router TL-WR802N V4(JP), with firmware version prior to 211202, is vulnerable to OS command injection. CVSS 3.1HIGH 8.8
  • TI-2023-18330 OS command injection in TP-Link TL-WR802N CVSS 3.1HIGH 8.8
  • TI-2021-02295 Unauthenticated stored cross-site scripting (XSS) exists in multiple TP-Link products… CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences