# CVE-2026-52890 — wekan

> As of 2026-07-16, CVE-2026-52890 is a HIGH-severity vulnerability in wekan, CVSS v3.1 7.1, EPSS 0.3% (24.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-52890 as of 2026-07-16; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-16

## What is CVE-2026-52890?

Wekan is open source kanban built with Meteor. Prior to 9.31, Wekan allows a logged-in board member to insert an attachment document through the /attachments/insert DDP method with attacker-controlled versions.original.path and versions.original.storage fields. The server/permissions/attachments.js insert rule checks only board write access, and FileStoreStrategyFilesystem.getReadStream() in models/lib/fileStoreStrategy.js streams the stored path without a storage-root containment check, allowing arbitrary file reads and denial of service through special files such as /dev/zero. This issue is fixed in version 9.31.

The record classifies CVE-2026-52890 under weakness classes [CWE-22](https://intel.threadlinqs.com/cwe/CWE-22), [CWE-400](https://intel.threadlinqs.com/cwe/CWE-400). 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. 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:** 7.1 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 24.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-15, last modified 2026-07-16

## Is CVE-2026-52890 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

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

## How to fix CVE-2026-52890

No vendor patch reference has been recorded for CVE-2026-52890 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-2026-52890

No threat campaign in the Threadlinqs corpus currently references CVE-2026-52890, 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-g6vm-7757-pr88)

**Other references**

- [github.com](https://github.com/wekan/wekan/commit/fc92b342ceedcf38dbd614a0f7b50d6dc2b22eb8)
- [github.com (v9)](https://github.com/wekan/wekan/releases/tag/v9.31)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-52890
Full detection coverage and IOCs for threats exploiting CVE-2026-52890 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp