Rclone before v1.75.2 contains a credential exposure vulnerability in the b2 backend that leaks the live account Authorization token and SSE-C keys on HTTP redirects from --b2-download-url hosts. Attackers can observe a same-host HTTPS-to-HTTP downgrade redirect to capture the cleartext B2 token, or receive cross-host redirects disclosing SSE-C customer encryption keys.

Attack Vector Adjacent Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Adjacent Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
rclone rclone unaffected
Version Status Constraints
0 affected < 1.75.2
1.75.2 unaffected —

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Rclone Subscribe
Rclone Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rclone/rclone/security/advisories/GHSA-gpw7-77cq-9f72 cve-icon cve-icon
https://www.vulncheck.com/advisories/rclone-before-1.75.2-b2-credential-leak-on-redirect-via-b2-download-url cve-icon cve-icon
History

Sun, 25 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
Description Rclone before v1.75.2 contains a credential exposure vulnerability in the b2 backend that leaks the live account Authorization token and SSE-C keys on HTTP redirects from --b2-download-url hosts. Attackers can observe a same-host HTTPS-to-HTTP downgrade redirect to capture the cleartext B2 token, or receive cross-host redirects disclosing SSE-C customer encryption keys.
Title Rclone before v1.75.2 B2 Credential Leak on Redirect via --b2-download-url
First Time appeared Rclone
Rclone rclone
Weaknesses CWE-319
CPEs cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*
Vendors & Products Rclone
Rclone rclone
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-25T13:20:29.804Z

Reserved: 2026-10-25T12:27:12.266Z

Link: CVE-2026-116196

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-25T14:17:00.133

Modified: 2026-10-25T14:17:00.133

Link: CVE-2026-116196

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses