Is this vulnerability remotely exploitable?

Yes. Any party with network access to a vulnerable Misskey instance can attempt to exploit the flaw through exposed web or API endpoints. In many scenarios, exploitation may be easier with an authenticated account, but configuration-dependent anonymous access cannot be ruled out.

Does this vulnerability require authentication or special privileges?

Not necessarily. Some affected paths may be reachable by any network user, while others might require a basic user account. The core risk is that authorization checks are incomplete, enabling a user—authenticated or not—to gain access to data outside their intended permissions.

What is the safest general fix pattern?

The most robust fix is to centralize and enforce strict authorization checks for every data access operation. Each endpoint should verify both the identity and the specific permission of the caller for the resource in question, combined with strong input validation on all resource identifiers.

Severity:

HIGH RISK

(7.5)

Authorization Bypass via Insufficient Permission Checks (CWE-285) in Misskey Server

CVE-2026-28431

Published:

Mar 10, 2026

Status:

Analyzed

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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May 6, 2026

Vulnerability Type

Category:

Authorization / Access Control

CWE:

CWE-285

Impact:

Unauthorized Data Access and Potential Data Breach

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Authorization / Access Control

CWE:

CWE-285

Impact:

Unauthorized Data Access and Potential Data Breach

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Authorization Bypass via Insufficient Permission Checks (CWE-285) in Misskey Server

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

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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