Is CVE-2026-100870 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100870 being exploited in the wild.

How severe is CVE-2026-100870?

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, and 2.2.9.

Is there a fix for CVE-2026-100870?

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-2026-100870 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-100870?

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-2026-100870: Sylius password-reset link Host header injection

CVE-2026-100870 · Severity: high · CVSS 8.8 · Published 2026-09-27

Sylius, an open-source e-commerce platform, builds administrator password-reset links using untrusted request headers without validation. An attacker can forge requests with malicious Host headers to redirect password-reset tokens to attacker-controlled domains, compromising administrator accounts and gaining full control of the e-commerce system.

Technologies: Sylius. Vendors: Sylius.

Quick answers

Is CVE-2026-100870 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100870 being exploited in the wild.
How severe is CVE-2026-100870?: 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, and 2.2.9.
Is there a fix for CVE-2026-100870?: 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-2026-100870 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-100870?: 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 exists in password-reset link generation, where the application constructs reset URLs using the HTTP Host header directly without validation. An unauthenticated attacker can request a password reset for a known administrator email address while supplying a forged Host header, causing the reset token to be sent to an attacker-controlled domain. This allows token interception and subsequent account takeover.

Affected products

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

Timeline

2026-09-27: disclosed

References

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