Windmill Exposes Workspace Slack OAuth Client Secrets to Non-Admin Workspace Members

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Summary

CVECVE-2026-26964
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-20 00:16:16 UTC
Updated2026-04-14 00:50:19 UTC
DescriptionWindmill 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.

Risk And Classification

Primary CVSS: v3.1 2.7 LOW from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

Problem Types: CWE-200 | NVD-CWE-noinfo | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary2.7LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED2.7LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Windmill Windmill All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Windmill-labs Windmill affected < 1.635.0 Not specified

References

ReferenceSourceLinkTags
github.com/windmill-labs/windmill/security/advisories/GHSA-f27g-j463-q85w [email protected] github.com Exploit, Vendor Advisory
github.com/windmill-labs/windmill/releases/tag/v1.635.0 [email protected] github.com Product, Release Notes
github.com/windmill-labs/windmill/commit/43218c62852490d0efafa8f94385bfe... [email protected] github.com Patch
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