A CRITICAL-severity vulnerability identified as CVE-2026-14494 has been published on August 29, 2026 with a CVSS base score of 9.8. 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-2026-14494
Severity: CRITICAL
CVSS Score: 9.8
Published: August 29, 2026
Weakness (CWE): CWE-434
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Confidentiality Impact | High |
| Integrity Impact | High |
| Availability Impact | High |
Technical Description
The Sigma Forms Pro plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.4.5 via the handle_form_submission function. This is due to the plugin dynamically granting the unfiltered_upload capability to all users during form submissions and bypassing MIME type validation when allowed_file_types is not configured. This makes it possible for unauthenticated attackers to execute code on the server. Several default pre-built templates including Job Application, Support Ticket, and Wholesale Application have file upload fields with no file type restrictions configured by design, making this vulnerability immediately exploitable upon installation.
Potential Impact
If exploited, this critical-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:
- Monitor the official NVD page and vendor channels for patch announcements.
- Restrict access to the affected system or service where possible.
- Apply network-level mitigations such as firewall rules or WAF policies.
- Enable logging and alerting for anomalous activity related to this vulnerability.
- Review your incident response plan in case of active exploitation.
References
Related Security Advisories
- [HIGH] CVE-2026-16601 — CVSS 8.8 (August 25, 2026) — HIGH / CVSS 8.8
- [HIGH] CVE-2026-18438 — CVSS 8.8 (August 15, 2026) — HIGH / CVSS 8.8
- [CRITICAL] CVE-2026-32479 — CVSS 9.3 (August 27, 2026) — CRITICAL / CVSS 9.3
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