CVE-2026-28474

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.

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - disclosure@vulncheck.com

Published

2026-03-05

Last modified

2026-09-17

Weaknesses

CWE-863

Affected products

• Nextcloud-talk (Openclaw)
• Openclaw (Openclaw)

References

• https://github.com/openclaw/openclaw/commit/6b4b6049b47c3329a7014509594647826669892d
• https://github.com/openclaw/openclaw/security/advisories/GHSA-r5h9-vjqc-hq3r
• https://www.vulncheck.com/advisories/openclaw-nextcloud-talk-allowlist-bypass-via-actorname-display-name-spoofing