CVE-2026-100531 openclaw Slack before 2026.8.1 Authorization Bypass
An authenticated user can download files from unauthorized Slack conversations due to a fail-open authorization check in the download handler.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100531?
CVE-2026-100531 is a high-severity missing authorization vulnerability in openclaw slack, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The @openclaw/slack npm package before 2026.8.1 contains an authorization flaw in its Slack download-file handler: when a file lacks the share metadata used to prove it belongs to the requested conversation, the conversation-authorization check fails open. An authenticated caller restricted to a single conversation who knows or obtains a file identifier can therefore download file contents from outside that conversation's scope, disclosing data across configured conversation boundaries. The issue does not allow listing arbitrary Slack files and does not bypass Slack authentication itself. The issue is fixed in version 2026.8.1.
Weakness: CWE-639
Which versions are affected by CVE-2026-100531?
How do I fix CVE-2026-100531?
No fix has been published for CVE-2026-100531 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-100531 being exploited?
There is no known exploitation of CVE-2026-100531 in the wild and no public exploit code.
Sources
Also known as GHSA-5xhr-95ww-q9w4, GHSA-v7hh-7676-rg67.