# CVE-2026-52891 — wekan

> As of 2026-07-15, CVE-2026-52891 is a CRITICAL-severity vulnerability in wekan, CVSS v3.1 9.9, EPSS 0.4% (32.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-52891 as of 2026-07-15; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-15

## What is CVE-2026-52891?

Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionality embeds user-supplied filenames into paths later passed to child_process.exec() for MIME-type detection. Because models/avatars.js and models/fileValidation.js used a shell command with the avatar filename, shell metacharacters such as backticks and $() in the filename could execute commands on the server. This issue is fixed in version 9.07.

The record classifies CVE-2026-52891 under weakness classes [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78), [CWE-88](https://intel.threadlinqs.com/cwe/CWE-88). 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, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 82 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.9 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 32.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-15

## Is CVE-2026-52891 being exploited?

It currently carries a trending score of 38 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [wekan](https://intel.threadlinqs.com/vendors/wekan): wekan

## How to fix CVE-2026-52891

No vendor patch reference has been recorded for CVE-2026-52891 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-2026-52891

No threat campaign in the Threadlinqs corpus currently references CVE-2026-52891, 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 2026-07-16. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g)

**Other references**

- [github.com](https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9)
- [github.com (v9)](https://github.com/wekan/wekan/releases/tag/v9.07)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-52891
Full detection coverage and IOCs for threats exploiting CVE-2026-52891 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp