by Kastro
Paper/Archive/CVE-2026-28474

CVE-2026-28474

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

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 46.2.462 × 209.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
nextcloud-talk< 2026.2.62026.2.6CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorygithub.com/openclaw/openclaw/security/advisories/GHSA-r5h9-vjqc-hq3rpatchgithub.com/openclaw/openclaw/commit/6b4b6049b47c3329a7014509594647826669892dwriteupvulncheck.com/advisories/openclaw-nextcloud-talk-allowlist-bypass-via-actorname-display-name-spoofing