CVE-2026-28474

OpenClaw Nextcloud Talk < 2026.2.6 - Allowlist Bypass via actor.name Display Name Spoofing

State: Published
Severity: 9.3 Critical
Published: Mar 5, 2026
Updated: Sep 17, 2026
Reserved: Feb 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
nextcloud-talkOpenClaw	before 2026.2.6Affected

References

GitHub Security Advisory (GHSA-r5h9-vjqc-hq3r)vendor-advisory
Patch Commit #1patch
VulnCheck Advisory: OpenClaw Nextcloud Talk < 2026.2.6 - Allowlist Bypass via actor.name Display Name Spoofingthird-party-advisory

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