What is CVE-2026-53786?

CVE-2026-53786 is a medium-severity vulnerability in Rsyncproject Rsync, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-08-13.

How severe is CVE-2026-53786?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Rsyncproject Rsync

CVE-2026-53786

rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge fil…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Rsyncproject Rsync — versions 0, 3.5.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-53786?: CVE-2026-53786 is a medium-severity vulnerability in Rsyncproject Rsync, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-08-13.
How severe is CVE-2026-53786?: Medium severity. CVSS v3 base score is 6.5 out of 10.