CVE-2026-62947

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

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.

Affected

openwrt

CVSS v3.1 GITHUB

4.9 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS

0.52% chance of exploitation in the next 30 days, 43rd percentile

Published

2026-07-15

Proof-of-concept exploits (1)

• tc4dy/CVE-2026-53921-PoC-Exploit6★ · 2026-10-09

Security advisories

• openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq
• openwrt/cgi-io/pull/4
• openwrt/openwrt/releases/tag/v25.12.5

References

• CVE Record
• NVD entry

Related

• CVE-2026-0073
• CVE-2026-14762
• CVE-2026-15409
• CVE-2026-15410
• CVE-2026-24061
• CVE-2026-29000