[HIGH] CVE-2026-19812 — CVSS 8.8 (August 14, 2026)

A HIGH-severity vulnerability identified as CVE-2026-19812 has been published on August 14, 2026 with a CVSS base score of 8.8. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.

Vulnerability Details

CVE ID: CVE-2026-19812
Severity: HIGH
CVSS Score: 8.8
Published: August 14, 2026
Weakness (CWE): CWE-119

Technical Description

A weakness has been identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component product.so. This manipulation of the argument File causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

Potential Impact

If exploited, this high-severity vulnerability could allow an attacker to compromise sensitive data confidentiality, tamper with system integrity, cause a denial of service. Organizations running affected software should treat this as a priority remediation item.

Recommended Action

No official patch is available yet. Until one is released:

1. Monitor the official NVD page and vendor channels for patch announcements.
2. Restrict access to the affected system or service where possible.
3. Apply network-level mitigations such as firewall rules or WAF policies.
4. Enable logging and alerting for anomalous activity related to this vulnerability.
5. Review your incident response plan in case of active exploitation.

View full details on NVD →

References

• Reference 1
• Reference 2
• Reference 3
• Reference 4
• Reference 5

Related Security Advisories

• [HIGH] CVE-2026-19813 — CVSS 8.8 (August 14, 2026) — HIGH / CVSS 8.8
• [HIGH] CVE-2026-14721 — CVSS 8.8 (July 5, 2026) — HIGH / CVSS 8.8
• [HIGH] CVE-2026-11840 — CVSS 8.8 (August 13, 2026) — HIGH / CVSS 8.8