CVE-2026-51698
Unauthenticated POST can modify TOTOLINK T6 URL filter rules.
Is CVE-2026-51698 being exploited?
Not confirmed. CVE-2026-51698 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-51698?
CVE-2026-51698 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-51698?
Yes. A fix has been recorded for CVE-2026-51698. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-51698 affect?
CVE-2026-51698 affects TOTOLINK T6 firmware 4.1.5cu.748_B20211015, TOTOLINK T6 routers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51698?
Apply vendor firmware update immediately; block admin CGI from WAN until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can alter URL filter rules via POST to /cgi-bin/cstecgi.cgi, changing browsing policies, enabling redirects, bypasses or malicious content.
Immediate action required