# CVE-2026-82396 — sulu

> As of 2026-09-01, CVE-2026-82396 is a MEDIUM-severity vulnerability in sulu, CVSS v3.1 5.4, EPSS 0.1% (6.6th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-82396 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-2026-82396?

Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration variant to honor the inline query parameter for scriptable MIME types. The vulnerable stored Content-Type values include text/html, application/xhtml+xml, text/xml, and application/xml. An attacker with media upload permission can store an HTML, XHTML, or XML document and create a link using inline=1, causing the application to return the file on the Sulu origin instead of forcing Content-Disposition attachment. When an authenticated victim opens the link, attacker-controlled JavaScript can execute with the victim's Sulu-origin session and can read data or perform actions as that victim. This issue is fixed in versions 2.6.25 and 3.0.8.

The record classifies CVE-2026-82396 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first. 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:** 5.4 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 6.6% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3/10 — 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-2026-82396 being exploited?

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

## Affected products and versions

- **sulu**: sulu

## How to fix CVE-2026-82396

No vendor patch reference has been recorded for CVE-2026-82396 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-2026-82396

No threat campaign in the Threadlinqs corpus currently references CVE-2026-82396, 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 2026-09-02. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/sulu/sulu/security/advisories/GHSA-pp4x-ccxq-6r33)

**Other references**

- [github.com](https://github.com/sulu/sulu/commit/d061094f5b7bb1d5e974544fce30bede9c7adf8e)
- [github.com (2.6)](https://github.com/sulu/sulu/releases/tag/2.6.25)
- [github.com (3.0)](https://github.com/sulu/sulu/releases/tag/3.0.8)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-82396
Full detection coverage and IOCs for threats exploiting CVE-2026-82396 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp