PT-2026-34559 · Rustfs · Rustfs

Published 2026-04-22 · Updated 2026-04-30 · CVE-2026-40937

Positive Technologies (AI Summary)

CVSS v3.1

8.3

High

Base vector

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

Name of the Vulnerable Software and Affected Versions RustFS versions prior to 1.0.0-alpha.94

Description Four notification target admin API endpoints in rustfs/src/admin/handlers/event.rs use a check permissions helper that validates authentication but fails to perform admin-action authorization via validate admin request(). This allows a non-admin user to overwrite a shared admin-defined notification target by name, enabling the interception of bucket events and audit evasion by redirecting data to an attacker-controlled endpoint.

Recommendations Update to version 1.0.0-alpha.94.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-40937

GHSA-PFCQ-4GJR-6GJM

Affected Products

Rustfs

References · 8

• https://github.com/rustfs/rustfs/security/advisories/GHSA-pfcq-4gjr-6gjm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40937 · Security Note
• https://osv.dev/vulnerability/GHSA-pfcq-4gjr-6gjm · Vendor Advisory
• https://github.com/rustfs/rustfs · Note
• https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.94 · Note
• https://twitter.com/cybrsecpath/status/2047360884604121482 · Twitter Post
• https://twitter.com/CVEnew/status/2047359948397367591 · Twitter Post
• https://twitter.com/SelvaKtm2/status/2049906043464069218 · Twitter Post