# CVE-2026-49481 — seriousm4x UpSnap

> As of 2026-08-13, CVE-2026-49481 is a CRITICAL-severity vulnerability in seriousm4x UpSnap, CVSS v3.1 9.6, EPSS 0.8% (55.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-49481 as of 2026-08-13; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-13

## What is CVE-2026-49481?

UpSnap is a wake on lan web app. Versions prior to 5.4.0 have an OS command injection vulnerability in the UpSnap’s device management functionality due to the presence of unsafe shell command template interpolation using the ip and the mac fields. User-controlled values can be inserted into the wake_cmd and shutdown_cmd templates and executed via /bin/sh -c (Linux) or cmd /C (Windows) without sanitization, resulting in an authenticated Remote Code Execution (RCE). A low-privileged user with permission to create or edit devices can execute arbitrary operating system commands on the UpSnap hosted server. Version 5.4.0 patches the issue.

The record classifies CVE-2026-49481 under weakness class [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 54 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.6 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`)
- **EPSS (FIRST):** 0.8% probability of exploitation in the next 30 days, higher than 55.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-12, last modified 2026-08-13

## Is CVE-2026-49481 being exploited?

It currently carries a trending score of 43 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **seriousm4x**: UpSnap

## How to fix CVE-2026-49481

No vendor patch reference has been recorded for CVE-2026-49481 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-2026-49481

No threat campaign in the Threadlinqs corpus currently references CVE-2026-49481, 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, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-14. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-6mc7-6948-w5h4)

**Other references**

- [github.com](https://github.com/seriousm4x/UpSnap/releases/tag/5.4.0)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-49481
Full detection coverage and IOCs for threats exploiting CVE-2026-49481 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp