CVE-2026-62947
OpenWrt: ACL bypass and arbitrary root file read via cgi-io cgi-download
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.
INFO
Published Date :
July 15, 2026, 7:18 p.m.
Last Modified :
July 21, 2026, 4:06 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update OpenWrt to version 25.12.5 or later.
- Apply vendor-provided patches for the cgi-download handler.
- Review ACLs for ubus session files.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-62947.
| URL | Resource |
|---|---|
| https://github.com/openwrt/cgi-io/commit/72990b7489872112df31c94032637c907760bae4 | Patch |
| https://github.com/openwrt/cgi-io/pull/4 | Issue Tracking Patch |
| https://github.com/openwrt/openwrt/releases/tag/v25.12.5 | Release Notes |
| https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq | Vendor Advisory Exploit |
| https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq | Vendor Advisory Exploit |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-62947 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-62947
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-62947 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-62947 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:* versions up to (excluding) 25.12.5 Added Reference Type GitHub, Inc.: https://github.com/openwrt/cgi-io/commit/72990b7489872112df31c94032637c907760bae4 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/openwrt/cgi-io/pull/4 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/openwrt/openwrt/releases/tag/v25.12.5 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 15, 2026
Action Type Old Value New Value Added Reference https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq Added SSVC {'id': 'CVE-2026-62947', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-15T19:31:15.364055Z'} -
New CVE Received by [email protected]
Jul. 15, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'openwrt', 'product': 'openwrt', 'versions': [{'status': 'affected', 'version': '< 25.12.5'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-22 Added Reference https://github.com/openwrt/cgi-io/commit/72990b7489872112df31c94032637c907760bae4 Added Reference https://github.com/openwrt/cgi-io/pull/4 Added Reference https://github.com/openwrt/openwrt/releases/tag/v25.12.5 Added Reference https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq