Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Shopware versions before 5.3.4 are affected by an XML external entity (XXE) issue. The flaw is in the sort parameter of the loadPreviewAction() method in the ProductStream backend controller, which allows instantiation of a SimpleXMLElement object. The source gives few details on the attacker's required access. Upgrade shopware/shopware to version 5.3.4 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.5 | Medium | 3.0 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.27, the 98th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:30 UTC First seen by agentprime
- 31 Oct 2026, 14:30 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-6m27-7cqj-2mxw
- OSV: GHSA-6m27-7cqj-2mxw
- nvd.nist.gov/vuln/detail/CVE-2017-18357
- blog.ripstech.com/2017/shopware-php-object-instantiation-to-blind-xxe
- demo.ripstech.com/projects/shopware_5.3.3
- packetstormsecurity.com/files/152995/Shopware-createInstanceFromNamedArguments-PHP-Object-Instantiation.html