Improper Authorization Affecting @openclaw/slack package, versions <2026.5.12
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-OPENCLAWSLACK-17393817
- published22 Jun 2026
- disclosed18 Jun 2026
- creditYLChen-007
Introduced: 18 Jun 2026
NewCVE-2026-53851 (opens in a new tab)How to fix?
Upgrade @openclaw/slack to version 2026.5.12 or higher.
Overview
@openclaw/slack is an OpenClaw Slack channel plugin for channels, DMs, commands, and app events.
Affected versions of this package are vulnerable to Improper Authorization via the reaction notification process. An attacker can trigger unintended agent processing for reaction events by delivering Slack reaction events even when reaction notifications are disabled. This is only exploitable if the Slack reaction event feature is enabled and reachable.