# CVE-2026-15511 — Comfast CF-WR631AX V3

> As of 2026-07-12, CVE-2026-15511 is a CRITICAL-severity vulnerability in Comfast CF-WR631AX V3, CVSS v3.1 9.8, EPSS 2.6% (84.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-15511 as of 2026-07-12; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-12

## What is CVE-2026-15511?

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.

The record classifies CVE-2026-15511 under weakness classes [CWE-78](https://cwe.mitre.org/data/definitions/78.html), [CWE-77](https://cwe.mitre.org/data/definitions/77.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 68 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 2.6% probability of exploitation in the next 30 days, higher than 84.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 8.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-12

## Is CVE-2026-15511 being exploited?

It currently carries a trending score of 51 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Comfast**: CF-WR631AX V3

## How to fix CVE-2026-15511

No vendor patch reference has been recorded for CVE-2026-15511 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-15511

No threat campaign in the Threadlinqs corpus currently references CVE-2026-15511, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-07-14.

**Exploit and proof of concept**

- [github.com — exploit](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))

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/377840)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/377840/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-15511)
- [vuldb.com — third party advisory (846719)](https://vuldb.com/submit/846719)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-15511
Full detection coverage and IOCs for threats exploiting CVE-2026-15511 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp