CVE-2026-90689 Tenda W20E formDelWebAuthWhiteUser stack-based overflow
A remote attacker can trigger a stack-based buffer overflow in the Tenda W20E router via the webAuthWhiteUserIndex parameter, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90689?
CVE-2026-90689 is a high-severity memory corruption vulnerability in Tenda W20E, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in Tenda W20E 15.11.0.61068_1546_841_CN_TDC. Impacted is the function formDelWebAuthWhiteUser. Performing a manipulation of the argument webAuthWhiteUserIndex results in stack-based buffer overflow. The attack can be initiated remotely.
Which versions are affected by CVE-2026-90689?
How do I fix CVE-2026-90689?
No fix has been published for CVE-2026-90689 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-90689 being exploited?
There is no known exploitation of CVE-2026-90689 in the wild and no public exploit code.
Sources
Also known as GHSA-crxm-72cq-869m.