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CVE-2026-79779— rclone before v1.75.0 WebDAV Credential Exposure via HTTPS-to-HTTP Redirect

Quick assessment

Affected
rclone rclone
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rclone 在 v1.75.0 之前的版本中，在处理重定向时未能拒绝传输层降级（即从 HTTPS 降级到 HTTP），这允许攻击者在通过同主机 HTTPS 到 HTTP 的重定向后，以明文 HTTP 协议重放 Basic 授权头和 Cookie 头。处于中间位置的攻击者如果能够观察到明文的 HTTP 通信，就可以捕获并重新使用这些凭据，从而以被入侵账户的权限执行 WebDAV 操作。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
rclone rclone < 1.75.0 affected
1.75.0 unaffected
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I. Basic Information for CVE-2026-79779

Vulnerability Information
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Vulnerability Title
rclone before v1.75.0 WebDAV Credential Exposure via HTTPS-to-HTTP Redirect
Source: CVE Program / CVE List V5
Vulnerability Description
rclone versions before v1.75.0 fail to reject transport downgrades in redirect handling, allowing Basic authorization and Cookie headers to be replayed over plaintext HTTP after same-host HTTPS-to-HTTP redirects. An on-path attacker observing the plaintext hop can capture and reuse credentials to perform WebDAV operations with the compromised account's permissions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rclone rclone 0 ~ 1.75.0 -

II. Public POCs for CVE-2026-79779

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III. Intelligence Information for CVE-2026-79779

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Vendor Advisories for CVE-2026-79779 (1)

Same Patch Batch · rclone · 2026-08-25 · 9 CVEs total

CVE-2026-79781 6.5 MEDIUM rclone serve s3 Path Traversal via dot-dot object keys
CVE-2026-79775 6.5 MEDIUM rclone Archive Backend SquashFS Parser Denial of Service
CVE-2026-79780 5.3 MEDIUM rclone before v1.75.0 Credential Exposure via S3 Redirect
CVE-2026-79778 5.3 MEDIUM rclone before v1.75.0 Denial of Service via TUS nil-response panic
CVE-2026-79776 5.3 MEDIUM rclone before 1.75.0 Authentication Bypass via pprof
CVE-2026-79783 3.6 LOW rclone before 1.74.4 Privilege Escalation via setuid Metadata
CVE-2026-79782 3.1 LOW rclone before 1.74.4 Security Token Disclosure via HTTPS to HTTP Redirect
CVE-2026-79777 2.7 LOW rclone before v1.75.0 Information Disclosure via RC API

IV. Related Vulnerabilities

Same product: rclone
Same vendor: rclone
Same weakness: CWE-319

V. Comments for CVE-2026-79779

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