November 14, 2026

CVE Watchtower

CVE-2026-129258Tenda AC18 Insufficient Verification of Data Authenticity

NVD

Vulnerability Summary

A vulnerability was identified in Tenda AC18 15.03.05.05_multi/15.03.05.19 Build 6318. Affected by this vulnerability is an unknown functionality of the file /cgi-bin/upgrade of the component Firmware Upgrade Handler. Such manipulation of the argument upgradeFile leads to insufficient verification of data authenticity. The attack may be launched remotely. The exploit is publicly available and might be used.
Severity Level
CRITICAL(9.4)
Published Date
Nov 14, 2026
Last Modified
Nov 14, 2026
Exploitation Status
Public exploit available
Root Weakness (CWE)
CWE-345: Insufficient Verification of Data Authenticity ↗
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
CVSS v4.0 Base Metrics — Score 9.4 (CRITICAL)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredHigh
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)High
Show CVSS v3.x metrics (score 9.1)
CVSS v3.1 Base Metrics — Score 9.1 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Tenda AC18 15.03.05.05_multi
  • Tenda AC18 15.03.05.19 Build 6318
Patched Versions
No patched version published yet
Until a fix ships, reduce exposure:
  • Restrict access to the affected service or interface to trusted networks.
  • Disable the affected feature if you do not need it.
  • Watch the vendor advisory for a firmware or software update.

What to do

Prioritize this fix. Exploit code is public, so attacks can follow quickly.

  1. Check whether you run Tenda AC18 and which version.
  2. No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
  3. Subscribe to the vendor advisory so you learn when a fix ships.
  4. Review logs and exposed services for signs of earlier compromise.

Timeline

  • Nov 14, 2026Published
  • Nov 14, 2026Record last modified
  • Nov 14, 2026PoC status changed: POC to UNKNOWN
  • Nov 14, 2026CVSS score changed: 9.4 to 8.5
  • Nov 14, 2026Severity changed: CRITICAL to HIGH
  • Nov 14, 2026PoC status changed: POC to UNKNOWN
  • Nov 14, 2026CVSS score changed: 9.4 to 8.5
  • Nov 14, 2026Severity changed: CRITICAL to HIGH

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 14, 2026 15:37 UTC