CVE-2026-52097 in AppFlowy
Summary
by MITRE • 09/10/2026
An issue in AppFlowy 0.11.8 allows a remote attacker to execute arbitrary code via the afLaunchUri, _afLaunchLocalUri (url_launcher.dart), OpenFilex.open, localPathRegex (common_patterns.dart) components
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified in AppFlowy version 0.11.8 represents a critical security flaw rooted in improper handling of Uniform Resource Identifiers and file system paths within the application's core utility modules. Specifically, the issue resides in the interaction between the url_launcher.dart implementation, which manages external protocol launches via afLaunchUri and _afLaunchLocalUri, and the common_patterns.dart module responsible for validating local path patterns through localPathRegex. This combination creates a vector where a remote attacker can craft malicious inputs that bypass intended validation logic, leading to arbitrary code execution on the target system. The flaw is particularly severe because it allows an adversary to leverage standard application features designed for convenience, such as opening files or launching external links, to inject and execute hostile commands under the context of the currently authenticated user.
From a technical perspective, the vulnerability stems from insufficient sanitization and validation of input data before it is processed by system-level APIs. The afLaunchUri function likely delegates URL handling to underlying operating system services without adequately verifying that the protocol scheme or target host adheres to a strict allowlist. Similarly, _afLaunchLocalUri appears to construct local file paths based on user-supplied or externally derived strings. When these inputs are passed to OpenFilex.open and evaluated against the regex pattern in common_patterns.dart, the regular expression may fail to account for edge cases such as path traversal sequences, null bytes, or encoded characters that can alter the intended execution flow. This lack of rigorous input validation allows an attacker to manipulate the file system interface, potentially directing the application to execute scripts, binaries, or other executable files located in arbitrary directories rather than the expected safe locations.
The operational impact of this vulnerability is significant, as it effectively grants a remote attacker full control over the victim's machine if they can trick the user into interacting with malicious content. This could involve receiving a specially crafted document within AppFlowy that triggers an automatic link launch or file open operation when viewed or edited. Once executed, the arbitrary code runs with the same privileges as the application itself, which typically implies standard user-level permissions but may escalate if the user has administrative rights or if specific system configurations allow privilege escalation. The attacker could use this access to install malware, exfiltrate sensitive data stored locally by AppFlowy such as notes and project files, establish persistence mechanisms, or pivot further into a network environment where the compromised machine resides. This scenario aligns with common attack patterns observed in productivity software vulnerabilities, where trust is placed in embedded content without sufficient verification of its origin or integrity.
This vulnerability maps directly to CWE-94 Improper Control of Generation of Code (Code Injection) and CWE-20 Improper Input Validation within the Common Weakness Enumeration framework. The failure to properly sanitize inputs before their use in system commands constitutes a classic code injection vector. Furthermore, from an offensive security perspective, this behavior is consistent with ATT&CK technique T1204 User Execution, where malware relies on user interaction to be executed, and potentially T1610 Drop Web Content if the attack involves downloading payloads via launched URLs. The reliance on external libraries like url_launcher.dart introduces additional risk surface area, as vulnerabilities in these dependencies can propagate directly into the host application without immediate detection by internal security controls.
Mitigation strategies must focus on implementing strict allowlisting for URL schemes and file paths rather than relying solely on blacklist-based regex patterns which are prone to bypasses using encoding or obfuscation techniques. Developers should ensure that any external protocol launch is explicitly authorized against a predefined list of safe protocols, such as https only, while rejecting dangerous ones like javascript, data, or custom local handlers unless absolutely necessary and heavily sandboxed. For file operations, it is critical to resolve all paths to their absolute canonical forms before processing them with OpenFilex.open, ensuring that no directory traversal sequences can escape the intended working directory. Additionally, implementing Content Security Policy principles within the application's internal logic can help restrict execution contexts. Users should be advised to update immediately to a patched version of AppFlowy where these input validation mechanisms have been hardened and tested against fuzzing attacks designed to exploit regex edge cases.