Auth bypass in Rucio
CVE-2026-58273
Rucio is a scientific data management framework. From 1.16.1 until 35.9.0, 38.6.0, and 41.0.0rc1, the /credentials/signurl endpoint reads X-Rucio-Account instead of the account stored in request.environ['issuer'] by token authentication. Any authenticated low-privilege user can supply root as the header value and pass the root-only get_signed_url permission check. The server then returns a presigned read, write, or delete URL for an attacker-selected object using stored S3, GCS, or Swift credentials, and X-Rucio-VO can select another tenant in multi-VO deployments. This permits data disclosure, modification, deletion, and cross-tenant access on cloud-backed RSEs. This issue is fixed in versions 35.9.0, 38.6.0, and 41.0.0rc1.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Rucio — versions >= 1.16.1, < 35.9.0, >= 36.0.0, < 38.6.0, >= 39.0.0, < 41.0.0rc1
Weakness classification (CWE)
References
- https://github.com/rucio/rucio/commit/64c0e6a6a93ae88427ff3b7d77532ce08c8a69ec
- https://github.com/rucio/rucio/commit/8bdc38994a8766658d0314d36afc104c9242c96f
- https://github.com/rucio/rucio/commit/8d9ba31514e6f5dca32b8c1db4738582cb37ec3a
- https://github.com/rucio/rucio/releases/tag/35.9.0
- https://github.com/rucio/rucio/releases/tag/38.6.0
- https://github.com/rucio/rucio/releases/tag/41.0.0rc1
- https://github.com/rucio/rucio/security/advisories/GHSA-5j9r-fx4x-rpvg
Frequently asked questions
- What is CVE-2026-58273?
- CVE-2026-58273 is a high-severity vulnerability in Rucio, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-11-05.
- How severe is CVE-2026-58273?
- High severity. CVSS v3 base score is 8.1 out of 10.