Tested fixes for CWE-613 in Express, Flask, Spring Boot, ASP.NET Core, Rails and Laravel: the vulnerable code, the fix, a plausible fix that still fails, and the regression tests.
The description above is MITRE’s definition of CWE-613 in CWE 4.20, a base-level weakness.
Common consequences MITRE lists
- Access Control: Bypass Protection Mechanism
Guides on this site
SCIM deprovisioning: make account disablement remove every usable authority
Connect SCIM resource updates to current sessions, tokens, group-derived permissions and background jobs, with explicit tenant mapping, CAEP revocation events and a measurable revocation contract.
Session management: cookies, timeouts, rotation and revocation
Model authentication as transitions in server authority, set session cookies and timeouts to current NIST and OWASP values, and verify fixation prevention, expiry, reauthentication, revocation and stolen-cookie defenses.
Defend JWTs against forgery, confusion and replay
Verify a JWT as an issuer-, type- and audience-bound assertion with an algorithm allowlist and trusted keys, closing the alg "none", key-confusion, header-injection, weak-secret and replay attacks.
Case study: the Okta support-system breach and session tokens in HAR files (2023)
How a service account password saved to a personal browser profile let an attacker download customers' HAR files from Okta's support system, replay the session tokens inside them against five customers, and stay unseen for two weeks; and why HAR files are credentials, admin sessions need binding, and every exposed credential must be rotated.
Case study: Citrix Bleed (CVE-2023-4966)
How a NetScaler memory over-read leaked session cookies that bypassed passwords and MFA in 2023, why patching did not end hijacked sessions, and how the pattern returned in 2025.
Practice
- JWT verification lab: Verify a JWT before trusting it · Browser lab
- Prove deprovisioning reaches sessions and queued work · Local project
References
This page is generated from MITRE’s CWE 4.20 catalogue (released 30 April 2026) and lists every guide, fix card and lab here that cites CWE-613.
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