CVE-2026-51693
Unauthenticated access-control bypass in TOTOLINK T6 firmware allows weakening of edge filtering
Is CVE-2026-51693 being exploited?
Not confirmed. CVE-2026-51693 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 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-51693?
CVE-2026-51693 is rated Critical with a CVSS score of 9.8. 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-2026-51693?
Not known from our data. No patch reference has been recorded for CVE-2026-51693, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-51693 affect?
CVE-2026-51693 affects TOTOLINK T6 firmware 4.1.5cu.748_B20211015, /cgi-bin/cstecgi.cgi setVpnPassCfg endpoint, Potentially similar TOTOLINK consumer routers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51693?
Isolate affected devices, restrict admin access, apply vendor firmware when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can POST to /cgi-bin/cstecgi.cgi setVpnPassCfg to bypass access control, weaken edge firewall/filtering, and alter VPN/password settings enabling traffic bypass or admin access.
Immediate action required