CVE-2026-28474: Nextcloud Talk allowlist bypass via actor.name display name spoofing

Summary

In affected versions of the optional Nextcloud Talk plugin (installed separately; not bundled with the core OpenClaw install), an untrusted webhook field (actor.name, display name) could be treated as an allowlist identifier. An attacker could change their Nextcloud display name to match an allowlisted user ID and bypass DM or room allowlists.

Details

Nextcloud Talk webhook payloads provide a stable sender identifier (actor.id) and a mutable display name (actor.name). In affected versions, the plugin’s allowlist matching accepted equality on the display name, which is attacker-controlled.

Affected Packages / Versions

• Package: @openclaw/nextcloud-talk (npm)
• Affected: <= 2026.2.2
• Fixed: >= 2026.2.6

Note: This advisory applies to the optional Nextcloud Talk plugin package. Core openclaw is not impacted unless you installed and use @openclaw/nextcloud-talk.

Fix Commit(s)

• 6b4b6049b47c3329a7014509594647826669892d

Timeline

• Introduced: 660f87278c9f292061e097441e0b10c20d62b31b (2026-01-20)
• Fixed in repo: 6b4b6049b47c3329a7014509594647826669892d (2026-02-04 UTC)
• First fixed tag containing the change: v2026.2.3
• First fixed npm release of @openclaw/nextcloud-talk: 2026.2.6 (published 2026-02-07 UTC)

Mitigation

Upgrade @openclaw/nextcloud-talk to >= 2026.2.6.

Release Process Note

The patched version range is set to the first npm release that contains the fix. Once you are ready, you can publish this advisory without additional version edits.

Thanks @MegaManSec (https://joshua.hu) of AISLE Research Team for reporting.