Concurrent SAML/OIDC Login Session Hijacking Flaw

For users authenticated through SAML or OpenID Connect (OIDC), this vulnerability can result in one user receiving another user's authenticated session when multiple SSO login attempts occur concurrently

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

This vulnerability affects enterprises relying on SAML or OpenID Connect for single sign-on (SSO) authentication. When multiple users attempt to authenticate simultaneously through these protocols, a race condition in session management can cause one user to receive another user's authenticated session token. This represents a critical identity and access control failure—an attacker exploiting this could gain unauthorized access to sensitive accounts without credentials, potentially compromising entire organizations that depend on centralized identity management. Any organization using SSO with SAML or OIDC implementations is at risk, particularly those with high concurrent login volumes.

Casky's 283 mapped security skills leverage Claude AI's extended reasoning to detect the attack patterns behind this session hijacking vulnerability across MITRE ATT&CK's Initial Access (TA0004) and Credential Access (TA0006) techniques. Practitioners using Casky would identify suspicious patterns including: concurrent authentication requests from the same identity provider with mismatched session identifiers, sudden spikes in failed session validation attempts, and anomalous token assignments where session claims don't match the requesting user. The platform's skill mapping enables detection of lateral movement indicators—such as unexpected resource access immediately following concurrent login attempts—and reveals when adversaries exploit the race condition window to assume high-privilege accounts. Security teams would see correlated findings across authentication logs, session management systems, and access control events that pinpoint the precise moment of session injection.

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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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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

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-2026-78428.

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

Investigate the attack patterns behind CVE-2026-78428

Casky has 283 skills that investigate the attack patterns behind CVE-2026-78428. Run one and get CVSS-scored findings in 3 minutes.

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