# CVE-2026-10031 — drakkan SFTPGo

> As of 2026-07-31, CVE-2026-10031 is a MEDIUM-severity vulnerability in drakkan SFTPGo, CVSS v3.1 4.2, EPSS 0.1% (7.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-10031 as of 2026-07-31; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-31

## What is CVE-2026-10031?

SFTPGo prior to 2.7.4 contains a permission bypass vulnerability that allows authenticated users to circumvent per-directory access controls by creating symbolic links in a permitted directory that point to files in directories where download, upload, or overwrite permissions are denied. Attackers can exploit the create_symlinks permission combined with read and write access in one directory to read or modify files in restricted directories, as operations are authorized against the link's directory permissions rather than the dereferenced target's directory permissions.

The record classifies CVE-2026-10031 under weakness class [CWE-863](https://intel.threadlinqs.com/cwe/CWE-863). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 67 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.2 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **CVSS v4.0 base score:** 2.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 7.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-30, last modified 2026-07-31

## Is CVE-2026-10031 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **drakkan**: SFTPGo

## How to fix CVE-2026-10031

No vendor patch reference has been recorded for CVE-2026-10031 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-2026-10031

No threat campaign in the Threadlinqs corpus currently references CVE-2026-10031, 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, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-03.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/drakkan/sftpgo/security/advisories/GHSA-fj9v-mxr3-w75w)
- [github.com — release notes](https://github.com/drakkan/sftpgo/releases/tag/v2.7.4)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/sftpgo-permission-bypass-via-symbolic-link-creation)

**Issue tracking and product pages**

- [github.com — product](https://github.com/drakkan/sftpgo)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-10031
Full detection coverage and IOCs for threats exploiting CVE-2026-10031 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp