# CVE-2026-82921 — ShopEx ECShop

> As of 2026-09-01, CVE-2026-82921 is a HIGH-severity vulnerability in ShopEx ECShop, CVSS v3.1 7.3, EPSS 0.2% (19.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-82921 as of 2026-09-01; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-01

## What is CVE-2026-82921?

A weakness has been identified in ShopEx ECShop up to 2.5.1. This affects the function check_img_type of the file admin/pack.php. Executing a manipulation of the argument pack_img can lead to unrestricted upload. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

The record classifies CVE-2026-82921 under weakness classes [CWE-434](https://intel.threadlinqs.com/cwe/CWE-434), [CWE-284](https://intel.threadlinqs.com/cwe/CWE-284). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 35 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.3 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 19.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-31, last modified 2026-09-01

## Is CVE-2026-82921 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **ShopEx**: ECShop

## How to fix CVE-2026-82921

No vendor patch reference has been recorded for CVE-2026-82921 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-2026-82921

No threat campaign in the Threadlinqs corpus currently references CVE-2026-82921, 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, FIRST EPSS. Last verified by Threadlinqs on 2026-09-01.

**Exploit and proof of concept**

- [uvxbywu62qm.feishu.cn — exploit](https://uvxbywu62qm.feishu.cn/wiki/TNENwNItlitygtk2uABcj02lndc?from=from_copylink)

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/397301)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/397301/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-82921)
- [vuldb.com — third party advisory (879229)](https://vuldb.com/submit/879229)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-82921
Full detection coverage and IOCs for threats exploiting CVE-2026-82921 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp