CVE-2026-21450
Published: 02 January 2026
Summary
CVE-2026-21450 is a high-severity Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336) vulnerability in Webkul Bagisto. Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 35.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-21450 is a server-side template injection vulnerability (CWE-1336) affecting Bagisto, an open source Laravel-based eCommerce platform. Versions prior to 2.3.10 are vulnerable through the "type" parameter, which enables attackers to inject malicious templates. The issue carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity due to its potential for high-impact exploitation.
The vulnerability can be exploited remotely over the network by unauthenticated attackers with low complexity and no user interaction required. Successful exploitation leads to remote code execution or other severe outcomes, such as full compromise of the affected server, granting high confidentiality, integrity, and availability impacts.
The official GitHub security advisory (GHSA-9hvg-qw5q-wqwp) confirms that upgrading to Bagisto version 2.3.10 resolves the issue by addressing the template injection flaw in the type parameter handling. Security practitioners should prioritize patching affected instances to mitigate risks.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-0028
Vulnerability details
Bagisto is an open source laravel eCommerce platform. Versions prior to 2.3.10 are vulnerable to server-side template injection via type parameter, which can lead to remote code execution or another exploitation. Version 2.3.10 fixes the issue.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE-2026-21450 is a server-side template injection (SSTI) vulnerability in a public-facing eCommerce application, enabling unauthenticated remote code execution via the 'type' parameter, directly mapping to T1190 (Exploit Public-Facing Application) and T1221 (Template Injection).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Mandates timely remediation of the server-side template injection flaw in Bagisto by patching to version 2.3.10, directly eliminating the vulnerability.
Requires validation of untrusted inputs like the 'type' parameter to block malicious template code that leads to remote code execution.
Enables vulnerability scanning to identify the SSTI in the type parameter, supporting prioritization and patching of this critical issue.