CVE-2026-51677 Missing authorization in n/a
Unauthenticated attackers can modify UPnP service state on TOTOLINK T6 routers by sending a crafted POST request due to missing access controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-51677?
CVE-2026-51677 is a critical missing authorization vulnerability in n/a, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Incorrect access control in the setUPnPCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change UPnP service state via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Weakness: CWE-284
Which versions are affected by CVE-2026-51677?
How do I fix CVE-2026-51677?
No fix has been published for CVE-2026-51677 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-51677 being exploited?
There is no known exploitation of CVE-2026-51677 in the wild and no public exploit code.
Sources
Also known as GHSA-vx8f-r949-23c9.