CVE-2026-100871 Sylius before 1.12.25, 1.13.17, 1.14.20, 2.1.16, and 2.2.9 JWT Audience Confusion Allows Admin API Authentication
Attackers can gain full administrative access by exploiting JWT audience confusion to impersonate admins via shop customer registration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100871?
CVE-2026-100871 is a high-severity authentication bypass vulnerability in Sylius, published on 27 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-100871?
How do I fix CVE-2026-100871?
No fix has been published for CVE-2026-100871 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-100871 being exploited?
There is no known exploitation of CVE-2026-100871 in the wild and no public exploit code.
Sources
Also known as GHSA-f6mx-qxjc-55xf, GHSA-mxrg-842r-h599.