JWT Token Firewall Bypass Enables Admin Impersonation

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.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Sylius e-commerce platform versions before specific patch levels fail to include firewall context in JWT tokens across their Admin and Shop API endpoints. This allows attackers to register a customer account using an administrator's email address, then leverage token resolution flaws to obtain administrative privileges. Organizations running affected Sylius versions—particularly those handling multi-tenant or multi-role environments—face critical risk of complete account takeover and unauthorized administrative access. The vulnerability is particularly dangerous because it requires minimal attacker effort: basic account registration combined with token manipulation can escalate privileges from customer to system administrator.

Casky's 283 matching skills leverage Claude's extended reasoning to identify this attack pattern across the MITRE ATT&CK tactics it spans. Practitioners will surface detections under TA0004 (Privilege Escalation) when token resolution anomalies appear—specifically when a customer-context token resolves to administrative permissions. The TA0006 (Credential Access) angle surfaces through monitoring for suspicious email reuse patterns where shop accounts share administrator email addresses. Casky skills analyze token structure inconsistencies, firewall context validation failures, and cross-endpoint token resolution mismatches, alerting practitioners to the exact moment an attacker attempts to exploit the missing firewall identification. Real-world findings would highlight unauthorized privilege escalation events correlated with fresh customer account creation and subsequent admin API access from unusual contexts.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-100871.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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