The description above is MITRE’s definition of CWE-208 in CWE 4.20, a base-level weakness.
Common consequences MITRE lists
- Confidentiality, Access Control: Read Application Data; Bypass Protection Mechanism
Guides on this site
Verify webhook deliveries before acting
Verify the provider’s signature over the correct bytes, then apply replay, authorization, and idempotency controls before a business action.
Padding oracle attacks
Use a byte-level CBC example to see how a tiny validity signal becomes plaintext information, then design verification that checks more than the error message.
Lucky Thirteen and POODLE: two different oracles
Compare two CBC oracles by their signal, protocol rules, and attacker prerequisites instead of treating them as interchangeable padding bugs.
Stop account takeover with the right MFA and login defenses
Rank MFA options by the attacks they stop, implement TOTP and push approvals correctly, and close the login, reset and recovery paths that attackers use instead of breaking the second factor.
Practice
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-208.
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