CVE-2026-53851

Description

### Summary Slack reaction events could ignore reaction notification settings. In affected versions, a Slack reaction event delivered to the configured app could enter the agent pipeline even when reaction notifications were disabled. This advisory is scoped to the named feature and configuration. It does not change OpenClaw's trusted-operator model: authenticated Gateway operators, installed plugins, and intentional local execution surfaces remain trusted unless a separate policy, approval, allowlist, sandbox, or auth boundary is crossed. ### Impact When the affected feature is enabled and reachable, this could trigger unintended agent processing for reaction events. Practical impact depends on the operator's configuration and whether lower-trust input can reach that path. ### Patched Versions The first stable patched version is `2026.5.12`. ### Mitigations disable or restrict Slack reaction event subscriptions until patched if this path is not needed. As general hardening, keep channel and tool allowlists narrow, avoid sharing one Gateway between mutually untrusted users, and disable the affected feature when it is not needed.

How to fix CVE-2026-53851

To remediate CVE-2026-53851, upgrade the affected package to a fixed version below.

• —upgrade to 2026.5.12 or later

Is CVE-2026-53851 being exploited?

No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-53851.

Affected packages (1)

• from 0, < 2026.5.12

CVSS scores

References (4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-53851
• PATCHgithub.com/openclaw/openclaw
• WEBgithub.com/openclaw/openclaw/security/advisories/GHSA-fcvx-5cxc-v5p8
• WEBwww.vulncheck.com/advisories/openclaw-slack-reaction-event-notification-bypass