Is this vulnerability remotely exploitable?

Yes. An attacker can host or embed a crafted affine: URL on a website or in other content. When the victim's browser invokes the URL and launches AFFiNE, attacker-controlled code can execute, provided the application is installed and registered as the affine: handler.

What level of access does an attacker need?

The attacker only needs to deliver a malicious affine: link to the victim—commonly via a webpage, embedded content, or messaging. No prior access to the victim's machine is required beyond the victim having AFFiNE installed and interacting with the malicious link.

What is the safest general fix pattern for developers?

Limit the capabilities of the custom URL scheme to a small set of non-dangerous actions and enforce strict input validation. Ensure that any data from the protocol handler cannot flow into dynamic evaluation, command construction, or file operations without robust validation and, where appropriate, explicit user consent.

Severity:

HIGH RISK

(8.8)

Code Injection via Custom URL Scheme (CWE-94) in AFFiNE Desktop Handler

CVE-2026-21853

Published:

Mar 2, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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CRITICAL RISK

CRITICAL

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Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94

Impact:

Remote Code Execution on Client Systems

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94

Impact:

Remote Code Execution on Client Systems

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Code Injection via Custom URL Scheme (CWE-94) in AFFiNE Desktop Handler

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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