Critical severity · published Jul 12, 2026
CVE-2026-15511
Comfast CF-WR631AX V3 FastCGI Backend webmgnt system_wl_upload_pic_file os command injection
9.8
CVSS
4.7%
EPSS
No
On KEV
Description
A vulnerability was determined in Comfast CF-WR631AX V3 up to 2.7.0.8. Affected by this vulnerability is the function system_wl_upload_pic_file of the file /usr/bin/webmgnt of the component FastCGI Backend. This manipulation of the argument filename causes os command injection. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)4.7% · higher than 92% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CV
CF-WR631AX V3 · Comfast
2.7.0.0; 2.7.0.1; 2.7.0.2; 2.7.0.3; 2.7.0.4; 2.7.0.5; +3 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15511
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15511
github.com
https://github.com/luminarydawn/cve/tree/main/Command%20Injection%20in%20Comfast%20CF-WR631AX%20V3%20%E2%80%94%20WiFi%20Portal%20Image%20Upload%20(CWE-78)
vuldb.com
https://vuldb.com/cve/CVE-2026-15511
vuldb.com
https://vuldb.com/submit/846719
vuldb.com
https://vuldb.com/vuln/377840
vuldb.com
https://vuldb.com/vuln/377840/cti
More from CF-WR631AX V3
6.3
CVE-2026-12814
Comfast CF-WR631AX V3 API Endpoint mbox-config system os command injection