CVE-2026-79780

MEDIUM 5.3

rclone before v1.75.0 Credential Exposure via S3 Redirect

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes. Attackers observing network traffic from a trusted endpoint can capture reusable IBM IAM tokens on same-host HTTPS-to-HTTP downgrades or SSE-C keys on cross-origin redirects to access protected S3 objects.

CWE	CWE-200
Vendor	rclone
Product	rclone
Published	Aug 25, 2026
Last Updated	Aug 25, 2026

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CVSS v3 Breakdown

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

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

rclone / rclone

0 < 1.75.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/rclone/rclone/security/advisories/GHSA-8mxv-9xhp-86h4 vulncheck.com: https://www.vulncheck.com/advisories/rclone-before-credential-exposure-via-s3-redirect

Credits

🔍 cyberlanc3r ncw