How broadly exploitable is this vulnerability?

Any authenticated user who can change their display name on a Nextcloud instance using the vulnerable plugin can potentially exploit this issue to access conversations protected by name-based allowlists. The impact depends on how widely the plugin is used to enforce restrictions on DMs and rooms.

Does an attacker need privileged access or an admin account?

No. The attacker only needs a regular Nextcloud account with permission to modify their own display name. They do not need control over the allowlist configuration or any elevated administrative role.

What is the safest general fix pattern?

Rework the authorization logic so that allowlists are defined and enforced using stable, canonical user identifiers (such as internal user IDs or verified account IDs) rather than display names. Ensure that all access control checks retrieve identity from a trusted authentication source instead of user-controlled profile fields.

Severity:

CRITICAL RISK

(9.8)

Improper Authorization via Mutable Display Name Matching (CWE-863) in OpenClaw Nextcloud Talk Plugin

CVE-2026-28474

Published:

Mar 5, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

(9.9)

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

Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

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

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Improper Authorization

CWE:

CWE-863

Impact:

Bypass of Access Controls and Unauthorized Conversation Access

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Authorization

CWE:

CWE-863

Impact:

Bypass of Access Controls and Unauthorized Conversation Access

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Improper Authorization via Mutable Display Name Matching (CWE-863) in OpenClaw Nextcloud Talk Plugin

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

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare