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CVE-2026-79782— rclone before 1.74.4 Security Token Disclosure 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是Rclone团队开源的一款命令行云存储文件同步工具。 Rclone 1.74.4之前版本存在加密问题漏洞，该漏洞源于当S3重定向将协议从HTTPS更改为HTTP时，未移除X-Amz-Security-Token标头，可能导致攻击者拦截明文HTTP流量以获取请求标头中发送的AWS STS会话令牌。

CVSS 3.1 · Low EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 2

VendorProduct Version RangeStatus
rclone rclone < 1.74.4 affected
1.74.4 unaffected
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I. Basic Information for CVE-2026-79782

Vulnerability Information
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Vulnerability Title
rclone before 1.74.4 Security Token Disclosure via HTTPS to HTTP Redirect
Source: CVE Program / CVE List V5
Vulnerability Description
rclone before 1.74.4 fails to strip the X-Amz-Security-Token header when an S3 redirect changes scheme from HTTPS to HTTP on the same host. Attackers can intercept plaintext HTTP traffic to capture AWS STS session tokens sent in request headers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/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
Vulnerability Title
Rclone 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rclone是Rclone团队开源的一款命令行云存储文件同步工具。 Rclone 1.74.4之前版本存在加密问题漏洞，该漏洞源于当S3重定向将协议从HTTPS更改为HTTP时，未移除X-Amz-Security-Token标头，可能导致攻击者拦截明文HTTP流量以获取请求标头中发送的AWS STS会话令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rclone rclone 0 ~ 1.74.4 -

II. Public POCs for CVE-2026-79782

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III. Intelligence Information for CVE-2026-79782

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Vendor Advisories for CVE-2026-79782 (1)

Other References for CVE-2026-79782 (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-2026-79779 5.3 MEDIUM rclone before v1.75.0 WebDAV Credential Exposure via HTTPS-to-HTTP 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-2026-79777 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-2026-79782

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