CVE-2026-28474

CRITICAL
2026-03-05 [email protected] GHSA-r5h9-vjqc-hq3r
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:06 vuln.today
CVE Published
Mar 05, 2026 - 22:16 nvd
CRITICAL 9.8

Tags

Authentication Bypass Nextcloud

Description

OpenClaw's Nextcloud Talk plugin versions prior to 2026.2.6 accept equality matching on the mutable actor.name display name field for allowlist validation, allowing attackers to bypass DM and room allowlists. An attacker can change their Nextcloud display name to match an allowlisted user ID and gain unauthorized access to restricted conversations.

Analysis

Display name spoofing bypass in OpenClaw Nextcloud Talk plugin before 2026.2.6.

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Remediation

Within 24 hours: Identify all Nextcloud Talk instances and document current plugin versions; disable DM and room allowlist features if operationally feasible, or restrict Talk usage to trusted internal networks only. Within 7 days: Contact OpenClaw for patch availability timeline and consider upgrading to version 2026.2.6 or later if released; implement network-level monitoring for Talk traffic anomalies. …

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Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: 0

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CVE-2026-28474 vulnerability details – vuln.today
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