Auth bypass in Sylius
CVE-2026-100871
Sylius versions before 1.12.25, 1.13.17, 1.14.20, 2.1.16, and 2.2.9 fail to include firewall identification in JWT tokens issued by separate Admin and Shop API endpoints. Attackers can register a shop customer account using an administrator's email address and obtain a token that the Admin API resolves to that administrator, granting full administrative access.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/Sylius/Sylius (product)
- github.com/Sylius/Sylius/commit/cdfb672a4d174eb2c73159b25cf5b5f44088f45c (patch)
- github.com/Sylius/Sylius/pull/19213 (issue-tracking, patch)
- github.com/Sylius/Sylius/releases/tag/v2.2.9 (release-notes)
- github.com/Sylius/Sylius/security/advisories/GHSA-f6mx-qxjc-55xf (vendor-advisory)
- www.vulncheck.com/advisories/sylius-before-1.12.25-1.13.17-1.14.20-2.1.16-and-2… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100871?
- CVE-2026-100871 is a high-severity vulnerability in Sylius, classified under Improper Authentication. CVSS score: 8.8/10. Published 2026-09-27.
- How severe is CVE-2026-100871?
- High severity. CVSS v3 base score is 8.8 out of 10.