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

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.