CVE-2026-129258

CRITICAL 9.1

Tenda AC18 Firmware Upgrade upgrade data authenticity

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-345
Vendor	tenda
Product	ac18
Published	Nov 14, 2026

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CVSS v3 Breakdown

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 Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Tenda / AC18

15.03.05.05_multi 15.03.05.19 Build 6318

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/437295 vuldb.com: https://vuldb.com/vuln/437295/cti vuldb.com: https://vuldb.com/cve/CVE-2026-129258 vuldb.com: https://vuldb.com/submit/1043033 github.com: https://github.com/longqx223/Tenda-ac-18-V15.03.05.05-/blob/main/2026-10-19-Tenda-AC18-unsigned-firmware-update-advisory-EN.pdf tenda.com.cn: https://www.tenda.com.cn/

Credits

🔍 Longqxxixi (VulDB User)