Is CVE-2026-100871 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100871 being exploited in the wild.

How severe is CVE-2026-100871?

High severity, with a CVSS score of 8.8, published 27 September 2026.

Which products and versions are affected?

Sylius before 1.12.25, 1.13.17, 1.14.20, 2.1.16, 2.2.9.

Is there a fix for CVE-2026-100871?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-100871 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-100871?

Check whether you run Sylius at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-100871: Sylius JWT token firewall identification bypass

CVE-2026-100871 · Severity: high · CVSS 8.8 · Published 2026-09-27

Sylius is an open-source eCommerce platform that manages both customer storefronts and administrative functions through separate APIs. A flaw in how JWT authentication tokens are issued allows an attacker to register a customer account with an administrator's email address, obtain a token, and use it to gain full administrative access to the platform. This enables complete takeover of the eCommerce business and access to sensitive data.

Technologies: Sylius. Vendors: Sylius.

Quick answers

Is CVE-2026-100871 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100871 being exploited in the wild.
How severe is CVE-2026-100871?: High severity, with a CVSS score of 8.8, published 27 September 2026.
Which products and versions are affected?: Sylius before 1.12.25, 1.13.17, 1.14.20, 2.1.16, 2.2.9.
Is there a fix for CVE-2026-100871?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-100871 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-100871?: Check whether you run Sylius at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability stems from JWT tokens issued by the Admin and Shop API endpoints failing to include firewall identification, allowing tokens to be resolved interchangeably across both endpoints. An attacker can register a shop customer using an administrator's email, receive a Shop API token, and present it to the Admin API endpoint where it resolves to the administrator account. This is an authentication bypass requiring only network access and the ability to create a customer account.

Affected products

Sylius Sylius before 1.12.25, 1.13.17, 1.14.20, 2.1.16, 2.2.9

Timeline

2026-09-27: disclosed: CVE-2026-100871 published

References

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