CVE-2026-62947CWE-22

OpenWrt: ACL bypass and arbitrary root file read via cgi-io cgi-download

Medium · published July 15, 2026

CVSS v3.1
4.9
EPSS
1%
Percentile
43.6
In the wild
Unconfirmed
What it is

OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, the cgi-download handler in cgi-io authorizes the requested path against the caller's ubus session file ACL before canonicalization, and rpcd session.c uses fnmatch() without FNM_PATHNAME, allowing traversal such as an allowed wildcard prefix followed by ../ to read root-readable files including /etc/shadow. This vulnerability is fixed in 25.12.5.

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00524 · 43.6th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-07-15T17:55Z
EPSS history
Timeline
  • 15 JUL 17:55Z
    OpenWrt: ACL bypass and arbitrary root file read via cgi-io cgi-download
    cvelistv5