Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Shopware shopware/shopware versions 5.1.4 up to but not including 5.7.18 have a flaw in mail address validation during registration. An attacker who can register accounts can construct different email addresses that resolve to the same address, so one address can be shared by multiple accounts. Upgrade to 5.7.18. For older versions, the source points to a Shopware security plugin.
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 |
|---|---|---|---|---|
| 5.3 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0065, the 51st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:31 UTC First seen by agentprime
- 31 Oct 2026, 14:31 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-gh66-fp7j-98v5
- OSV: GHSA-gh66-fp7j-98v5
- github.com/shopware/shopware/security/advisories/GHSA-gh66-fp7j-98v5
- github.com/shopware5/shopware/security/advisories/GHSA-gh66-fp7j-98v5
- nvd.nist.gov/vuln/detail/CVE-2023-34099
- github.com/shopware5/shopware/commit/39cc714d9a0be33b43877044d0b88ea3c6b43f3d
- docs.shopware.com/en/shopware-5-en/security-updates/security-update-06-2023
- github.com/shopware5/shopware
- www.shopware.com/en/changelog-sw5/#5-7-18