CVE-2026-129258 — Tenda Ac18 Firmware
CRITICALCVE-2026-129258 is a critical-severity (CVSS 9.1) CWE-345 vulnerability in tenda ac18 firmware. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
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…
Description
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.
Affected Products
ac18 firmwaretendaDetection & mitigation playbook
Vendor / applianceDetect
Inventory every tenda ac18 firmware deployment and check each version against the affected-products list above.
Remediation status
The records we use list no fixed version for CVE-2026-129258. Check the tenda ac18 firmware advisory for a patched release, and apply the workarounds below until you can upgrade.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-129258 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.