CVE-2026-34123 Whitelist Validation Bypass in TP-Link Tapo C520WS
Attackers with restricted accounts can bypass API whitelist restrictions to execute unauthorized sensitive operations, causing device resets or configuration changes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34123?
CVE-2026-34123 is a high-severity authentication bypass vulnerability in TP-Link Systems Inc. Tapo C520WS v2, published on 5 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
On Tapo C520WS v2, restricted accounts (for example, hub users) are intended to execute only a limited set of low‑sensitivity operations. Due to a logic flaw in the device’s API authorization mechanism, an attacker can craft requests that leverage legitimate “method mapping” behavior to bypass whitelist restrictions, allowing restricted operations to be masked as permitted requests and executed.
Successful exploitation may allow an attacker (with access to a restricted account) to execute unauthorized sensitive operations. Depending on the operation invoked, impact could include device resets, unintended configuration changes, or disruption of normal operation, leading to loss of availability and integrity of the device.
Weakness: CWE-287
Which versions are affected by CVE-2026-34123?
How do I fix CVE-2026-34123?
No fix has been published for CVE-2026-34123 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-34123 being exploited?
There is no known exploitation of CVE-2026-34123 in the wild and no public exploit code.
Sources
Also known as GHSA-x7cf-gm5r-xq89.