CVE-2026-28474
Analyzed Analyzed - Analysis Complete
Authentication Bypass in OpenClaw Nextcloud Talk via Display Name Spoofing

Publication date: 2026-03-05

Last updated on: 2026-05-06

Assigner: VulnCheck

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.
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Meta Information
Published
2026-03-05
Last Modified
2026-05-06
Generated
2026-06-16
AI Q&A
2026-03-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-28474
EUVD
EUVD-2026-9920
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openclaw openclaw to 2026.2.6 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
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Executive Summary

This vulnerability exists in OpenClaw's Nextcloud Talk plugin versions prior to 2026.2.6. It allows attackers to bypass direct message (DM) and room allowlists by exploiting the way the plugin validates users. Specifically, the plugin accepts equality matching on the mutable actor.name display name field for allowlist validation. An attacker can change their Nextcloud display name to match an allowlisted user ID, thereby gaining unauthorized access to restricted conversations.

Impact Analysis

The impact of this vulnerability is significant because it allows unauthorized users to access private or restricted conversations by impersonating allowlisted users through display name changes. This can lead to exposure of sensitive information, breach of confidentiality, and potential misuse of private communication channels.

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