Medium severity · published Jul 15, 2026
CVE-2026-62947
OpenWrt: ACL bypass and arbitrary root file read via cgi-io cgi-download
4.9
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openwrt · openwrt
< 25.12.5 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62947
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62947
Patch
https://github.com/openwrt/cgi-io/commit/72990b7489872112df31c94032637c907760bae4
Issue Tracking
https://github.com/openwrt/cgi-io/pull/4
Release Notes
https://github.com/openwrt/openwrt/releases/tag/v25.12.5
Vendor Advisory
https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq
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