CVE-2026-4253: Tenda AC8 Web UploadCfg route_set_user_policy_rule os command injection

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-16 · updated 2026-06-17
Weakness: CWE-77

Description

A security flaw has been discovered in Tenda AC8 16.03.50.11. This affects the function route_set_user_policy_rule of the file /cgi-bin/UploadCfg of the component Web Interface. The manipulation of the argument wans.policy.list1 results in os command injection. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.

Affected products

Tenda AC8: 16.03.50.11

References

https://github.com/digitalandrew/tenda_ac8_v5/blob/main/poc_cmdi_config_upload.py
https://vuldb.com/?ctiid.351211
https://vuldb.com/?id.351211
https://vuldb.com/?submit.771771
https://www.tenda.com.cn/

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