Quick answers
- Is CVE-2026-86300 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86300 being exploited in the wild.
- How severe is CVE-2026-86300?
- High severity, with a CVSS score of 7.3, published 7 September 2026.
- Which products and versions are affected?
- Tenda Ac9 15.03.05.14, 15.03.05.16.
- Is there a fix for CVE-2026-86300?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-86300 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-86300?
- Check whether you run Tenda Ac9 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability resides in the R7WebsSecurityHandler function, which maintains an auth-exempt whitelist for certain endpoints. The flaw allows multiple unauthenticated requests: (1) /goform/fast_setting_wifi_set accepts a loginPwd parameter and directly commits it as the system administrator password without authentication or current-password verification, and (2) /goform/getProduct, /goform/getWanConnectStatus, and /goform/getRebootStatus leak sensitive device information. The root cause is improper string-prefix matching logic that allows whitelist bypass when endpoint paths match auth-exempt prefixes. Attack vector is network-based with no authentication required. An attacker can change the admin password remotely or enumerate device configuration. No patch information is currently available.
Affected products
- Tenda AC9 15.03.05.14, 15.03.05.16
Timeline
- 2026-09-07: disclosed