CVE-2026-81659 in Flowintel
Summary
by MITRE • 08/27/2026
Affected versions of Flowintel allow attacker-controlled note content to be processed by Pandoc and XeLaTeX during PDF export in a way that can cause local files on the Flowintel server to be read and incorporated into the generated export.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified within affected versions of Flowintel represents a critical security flaw rooted in improper neutralization of special elements used by an interpreter, specifically categorized under CWE-77: Injection via Pandoc and XeLaTeX processing during document generation workflows. This issue arises from the application's failure to adequately sanitize or validate user-supplied input before it is passed to external command-line utilities responsible for converting markdown content into PDF format. When a user creates or edits a note containing specific malicious payloads, these inputs are not filtered against dangerous commands or file inclusion directives that can be interpreted by Pandoc and its underlying LaTeX engine, XeLaTeX. This lack of rigorous input validation allows an attacker to inject arbitrary system-level instructions directly into the document processing pipeline, bypassing standard application logic controls designed to restrict user actions to safe data manipulation only.
The technical mechanism behind this exploitation relies on the capabilities inherent in both Pandoc and XeLaTeX to process external resources and execute shell commands under certain configurations. By embedding specially crafted LaTeX code or Pandoc-specific syntax within a note title, body, or metadata field, an attacker can trigger file inclusion directives such as \input{} or \includegraphics{}, which reference local paths on the server hosting Flowintel. Because these utilities often run with the privileges of the web application process, they possess read access to files accessible by that user account. Consequently, when a PDF export is triggered for a note containing this malicious content, the LaTeX engine attempts to resolve and embed the specified file into the output document. This effectively transforms the vulnerability from a simple injection flaw into a Local File Read (LFR) attack vector, enabling the disclosure of sensitive server-side data that should remain inaccessible through normal application interfaces.
The operational impact of this vulnerability is severe, as it compromises the confidentiality integrity of the entire Flowintel deployment environment. An authenticated attacker can read arbitrary files from the server's filesystem, potentially accessing configuration files containing database credentials, API keys, private certificates, or other secrets stored in plaintext within the application directory structure. In more complex scenarios involving specific LaTeX packages and system configurations, this file reading capability may serve as a stepping stone for further exploitation, such as Remote Code Execution if write permissions to executable scripts are available. This aligns with MITRE ATT&CK technique T1083: File and Directory Discovery, where adversaries explore the target environment to locate valuable data sources. The ability to exfiltrate internal server files undermines trust in the platform's security model and can lead to broader system compromise if combined with other vulnerabilities or misconfigurations present on the host machine.
Mitigation strategies must focus on strict input sanitization and secure configuration of external processing tools. Developers should implement allowlist-based validation for all user inputs that are destined for Pandoc, ensuring that only expected alphanumeric characters, standard punctuation, and safe markdown syntax are permitted. Special attention must be paid to escaping or stripping LaTeX-specific control sequences like backslashes used in commands before they reach the rendering engine. Additionally, running the PDF generation process within a restricted environment with minimal file system permissions can limit the scope of files an attacker might access even if injection occurs. Upgrading to patched versions of Flowintel that address this input validation gap is essential for restoring security posture. Organizations should also monitor server logs for unusual patterns in Pandoc or XeLaTeX execution, such as frequent attempts to include non-existent paths or references to sensitive system directories like /etc/passwd or application configuration files, which may indicate active exploitation attempts against unpatched instances.