CVE-2026-100870: Sylius before 1.12.25, 1.13.17, 1.14.20, 2.1.16, and 2.2.9 Admin Password Reset Poisoning via Host Header

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-27 · updated 2026-09-30
Weakness: CWE-640

Description

Sylius versions before 1.12.25, 1.13.17, 1.14.20, 2.1.16, and 2.2.9 build administrator password-reset links using the request Host header without validation, allowing unauthenticated attackers to redirect reset tokens to attacker-controlled domains. Attackers can request password resets for known administrator email addresses with forged Host headers to intercept valid reset tokens and take over administrator accounts.

Affected products

Sylius: from 1.12.0 before 1.12.25; from 1.13.0 before 1.13.17; from 1.14.0 before 1.14.20; from 2.0.0 before 2.1.16; from 2.2.0 before 2.2.9 — fixed in 1.12.25, 1.13.17, 1.14.20, 2.1.16, 2.2.9

How to fix

Upgrade to a fixed version: Sylius 1.12.25, 1.13.17, 1.14.20, 2.1.16. Check the vendor advisory for mitigations.

References

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