{"record":{"id":"6e7bac67d90552a2","repo":"spring-projects/spring-security","slug":"given-that-there-is-no-default-password-encoder-co","errorCode":null,"errorMessage":"Given that there is no default password encoder configured, each password must have a password encoding prefix. Please either prefix this password with '{noop}' or set a default password encoder in `DelegatingPasswordEncoder`.","messagePattern":"Given that there is no default password encoder configured, each password must have a password encoding prefix\\. Please either prefix this password with '(.+?)' or set a default password encoder in `DelegatingPasswordEncoder`\\.","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"crypto/src/main/java/org/springframework/security/crypto/password/DelegatingPasswordEncoder.java","lineNumber":304,"sourceCode":"\t */\n\tprivate class UnmappedIdPasswordEncoder extends AbstractValidatingPasswordEncoder {\n\n\t\t@Override\n\t\tprotected String encodeNonNullPassword(String rawPassword) {\n\t\t\tthrow new UnsupportedOperationException(\"encode is not supported\");\n\t\t}\n\n\t\t@Override\n\t\tprotected boolean matchesNonNull(String rawPassword, String prefixEncodedPassword) {\n\t\t\tString id = extractId(prefixEncodedPassword);\n\t\t\tif (id != null && !id.isBlank()) {\n\t\t\t\tthrow new IllegalArgumentException(String.format(NO_PASSWORD_ENCODER_MAPPED, id));\n\t\t\t}\n\t\t\tif (prefixEncodedPassword != null && !prefixEncodedPassword.isBlank()) {\n\t\t\t\tint start = prefixEncodedPassword.indexOf(DelegatingPasswordEncoder.this.idPrefix);\n\t\t\t\tint end = prefixEncodedPassword.indexOf(DelegatingPasswordEncoder.this.idSuffix, start);\n\t\t\t\tif (start < 0 && end < 0) {\n\t\t\t\t\tthrow new IllegalArgumentException(NO_PASSWORD_ENCODER_PREFIX);\n\t\t\t\t}\n\t\t\t}\n\t\t\tthrow new IllegalArgumentException(String.format(MALFORMED_PASSWORD_ENCODER_PREFIX,\n\t\t\t\t\tDelegatingPasswordEncoder.this.idPrefix, DelegatingPasswordEncoder.this.idSuffix));\n\t\t}\n\n\t}\n\n}\n","sourceCodeStart":286,"sourceCodeEnd":314,"githubUrl":"https://github.com/spring-projects/spring-security/blob/96852e8860138a482cb13d1479573f24ff6443c6/crypto/src/main/java/org/springframework/security/crypto/password/DelegatingPasswordEncoder.java#L286-L314","documentation":"When matching, if the stored password contains neither the idPrefix nor the idSuffix, it carries no encoder id at all. With no default encoder configured for such raw-format passwords, DelegatingPasswordEncoder cannot pick a matcher and throws this IllegalArgumentException, suggesting '{noop}' prefixing or a default encoder.","triggerScenarios":"matches() with a password that is plain text or an unprefixed hash (e.g. old '$2a$10$...' BCrypt string without '{bcrypt}') on a DelegatingPasswordEncoder created without setDefaultPasswordEncoderForMatches.","commonSituations":"Migrating a legacy user store to Spring Security's delegating encoder; hand-inserted test users with raw '{noop}pass' missing; seeding data directly into the DB without the {id} wrapper.","solutions":["Re-prefix stored passwords with their encoding id, e.g. '{noop}secret' or '{bcrypt}$2a$10$...'","Call setDefaultPasswordEncoderForMatches(encoder) to handle unprefixed passwords (e.g. with a delegating NoOp or BCrypt default)","Re-encode the stored credentials into the {id}... format via a data migration","For dev/test data, insert passwords using the DelegatingPasswordEncoder's own encode() output"],"exampleFix":"// before\n// stored: $2a$10$dXJ3SW6G7P50lGmMkkmwe.20cQQubK3.HZWzG3YB1tlRy.fqvM/BG\n// after\n// stored: {bcrypt}$2a$10$dXJ3SW6G7P50lGmMkkmwe.20cQQubK3.HZWzG3YB1tlRy.fqvM/BG\n","handlingStrategy":"validation","validationCode":"if (storedPassword != null && !storedPassword.startsWith(\"{\")) {\n    throw new IllegalStateException(\"Stored password lacks {id} prefix: \" + storedPassword);\n}","typeGuard":null,"tryCatchPattern":"try {\n    return encoder.matches(rawPassword, storedPassword);\n} catch (IllegalArgumentException e) {\n    // fall back to legacy matching for unprefixed hashes\n    return legacyEncoder.matches(rawPassword, storedPassword);\n}","preventionTips":["Migrate all stored passwords to the '{id}encodedPassword' format","Set a default encoder via setDefaultPasswordEncoderForMatches for legacy/unprefixed values","Re-encode credentials through the delegating encoder at import time"],"tags":["spring-security","password-matching","missing-prefix","legacy-migration"],"backgroundTag":"missing-prefix-in-encoded-password","analyzedSha":"96852e8860138a482cb13d1479573f24ff6443c6","analyzedAt":"2026-09-10T23:25:23.477Z","contentChangedAt":"2026-09-10T23:25:23.477Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}