Auth bypass in Openclaw Slack
CVE-2026-100531
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (26.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-v7hh-7676-rg67) (vendor-advisory)
- VulnCheck Advisory: openclaw Slack before 2026.8.1 Authorization Bypass (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100531?
- CVE-2026-100531 is a medium-severity vulnerability in Openclaw Slack, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-09-26.
- How severe is CVE-2026-100531?
- Medium severity. CVSS v3 base score is 6.5 out of 10.