CVE-2026-79782: rclone before 1.74.4 Security Token Disclosure via HTTPS to HTTP Redirect

Severity: low (CVSS 3.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-09-10
Weakness: CWE-319

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.

Affected products

rclone: before 1.74.4 — fixed in 1.74.4

How to fix

Upgrade to a fixed version: rclone 1.74.4. Check the vendor advisory for mitigations.

References

https://github.com/rclone/rclone/security/advisories/GHSA-gx4c-2hqx-cw2r
https://www.vulncheck.com/advisories/rclone-before-security-token-disclosure-via-https-to-http-redirect

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