CVE-2026-123198
Received Received - Intake

Server-Side Template Injection in LMFDB

Publication date: 2026-11-05

Last updated on: 2026-11-05

Assigner: VulnCheck

Description
LMFDB before commit 01829bd contains a server-side template injection vulnerability in the render_knowl function that allows unauthenticated attackers to inject Jinja expressions via request parameters. Attackers can supply crafted query-string values or 'content' data to /knowledge/render/<ID> to reach Python builtins and execute operating system commands as the web application account.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-11-05
Last Modified
2026-11-05
Generated
2026-11-06
AI Q&A
2026-11-05
EPSS Evaluated
N/A
NVD
CVE-2026-123198
EUVD
EUVD-2026-117643

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
LMFDB LMFDB 0

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-1336 The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a Server-Side Template Injection (SSTI) vulnerability in LMFDB before commit 01829bd. Attackers can inject malicious Jinja expressions via request parameters into the render_knowl function. This allows unauthenticated users to execute arbitrary Python code and operating system commands on the server as the web application account.

Detection Guidance

To detect this vulnerability, check if your LMFDB instance is running a version prior to commit 01829bd. Inspect the /knowledge/render/<ID> endpoint for unauthenticated access and verify if request parameters like query-string values or 'content' data are being passed directly into Jinja templates without sanitization.

Impact Analysis

An attacker could exploit this to execute arbitrary commands on the server, potentially leading to data theft, site defacement, or using the server as a foothold for further attacks. The vulnerability allows full control over the application's service account privileges.

Compliance Impact

This vulnerability likely violates compliance requirements for data protection and security due to unauthorized code execution and potential data breaches. It could lead to unauthorized access to sensitive data, violating GDPR's integrity and confidentiality principles and HIPAA's security rule for protected health information.

Mitigation Strategies

Immediately update LMFDB to commit 01829bd or later. Ensure the /knowledge/render/<ID> endpoint is restricted to authenticated users only. Disable or remove the 'content' parameter handling in the knowledge rendering pipeline. Review and apply the changes from the pull request to prevent direct template injection.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-123198. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart

Security Radar

News mentioning this vulnerability
Loading related security news...