CVE-2026-51696: n/a
Description
CVE-2026-51696 is a critical vulnerability in TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It involves incorrect access control in the setPortForwardRules function, allowing unauthenticated attackers to expose internal services by sending a crafted POST request to /cgi-bin/cstecgi.cgi. The vulnerability has a CVSS score of 9.8, indicating high impact on confidentiality, integrity, and availability.
CVSS v3.1
Score 9.8critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-51696 affects TOTOLINK T6 version 4.1.5cu.748_B20211015 and is due to improper access control in the setPortForwardRules function. This flaw allows unauthenticated remote attackers to manipulate port forwarding rules by sending specially crafted POST requests to the /cgi-bin/cstecgi.cgi endpoint, potentially exposing internal services. The CVSS v3.1 base score is 9.8, reflecting network attack vector, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can lead to exposure of internal services, compromising confidentiality, integrity, and availability of the affected device and network. Attackers do not require authentication to exploit this vulnerability, increasing the risk of unauthorized access and potential further attacks on internal network resources.
Mitigation Recommendations
No patch or official fix information is currently available for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the device management interface from untrusted networks and monitor for suspicious POST requests to /cgi-bin/cstecgi.cgi as a temporary mitigation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-mppv-mgp5-f972
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-51696"]
Threat ID: 6a95befcacd9273b4966767a
Added to database: 08/31/2026, 17:50:52 UTC
Last enriched: 09/07/2026, 23:37:33 UTC
Last updated: 10/14/2026, 06:48:18 UTC
Views: 35
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.