Cyber Resilience

CVE-2026-21449

HighPublic PoC

Published: 02 January 2026

Published
02 January 2026
Modified
08 January 2026
KEV Added
—
Patch
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CVSS Score v4 7.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0046 36.1th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-21449 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 7.4 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 36.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2026-21449 is a server-side template injection vulnerability (CWE-1336) in Bagisto, an open-source Laravel eCommerce platform. The issue affects all versions prior to 2.3.10 and can be triggered via the first name and last name fields submitted by a low-privilege user.

A low-privilege authenticated user can exploit this vulnerability over the network with low attack complexity and no user interaction required. Exploitation enables high-impact compromise of confidentiality, integrity, and availability, earning a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

The official advisory from the Bagisto GitHub Security team at https://github.com/bagisto/bagisto/security/advisories/GHSA-mqhg-v22x-pqj8 confirms the vulnerability details, and upgrading to version 2.3.10 resolves the issue.

EU & UK References

Vulnerability details

Bagisto is an open source laravel eCommerce platform. Versions prior to 2.3.10 are vulnerable to server-side template injection via first name and last name from a low-privilege user. Version 2.3.10 fixes the issue.

CWE(s)
CWE-1336

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
Why these techniques?

SSTI in public-facing web app directly enables remote code execution via T1190; resulting arbitrary command/script execution maps to T1059.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-21448Same product: Webkul Bagisto
CVE-2026-21450Same product: Webkul Bagisto
CVE-2026-21447Same product: Webkul Bagisto
CVE-2026-21446Same product: Webkul Bagisto
CVE-2026-21451Same product: Webkul Bagisto
CVE-2026-34906Shared CWE-1336
CVE-2024-57177Shared CWE-1336
CVE-2024-54954Shared CWE-1336
CVE-2026-38530Same vendor: Webkul
CVE-2025-53833Shared CWE-1336

Affected Assets

webkul
bagisto
≤ 2.3.10

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Information input validation directly prevents server-side template injection by validating and sanitizing low-privilege user inputs in first name and last name fields before template processing.

SI-2 Flaw Remediation good match
prevent

Flaw remediation mandates timely patching to Bagisto version 2.3.10, which resolves the SSTI vulnerability.

RA-5 Vulnerability Monitoring and Scanning good match
preventdetect

Vulnerability monitoring and scanning identifies and remediates known issues like CVE-2026-21449 in the Bagisto platform.

References