Relax client_id validation in AtJwtBuilder#18890
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jzheaux merged 2 commits intospring-projects:mainfrom Mar 20, 2026
Merged
Relax client_id validation in AtJwtBuilder#18890jzheaux merged 2 commits intospring-projects:mainfrom
jzheaux merged 2 commits intospring-projects:mainfrom
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RFC 9068 requires that access token JWTs include the `client_id` claim, but it does not require resource servers to validate it against a specific value. Relates to spring-projectsgh-18381 Signed-off-by: Giacomo Baso <gbaso@users.noreply.github.com>
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type: enhancement
Closes spring-projectsgh-18381 Signed-off-by: Josh Cummings <3627351+jzheaux@users.noreply.github.com>
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Thanks, @gbaso, for the quick turnaround! This will merge once the build completes. |
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AtJwtBuildercurrently requires configuring a specificclient_idvalue, and tokens that containing a differentclient_idare rejected. As discussed in #18381 (comment), this is a stronger requirement than that specified in RFC 9068, which only requires that aclient_idclaim is present.In scenarios like the
client_credentialsgrant type, multiple clients may obtain tokens from the same issuer and call the same resource server. In these cases, the resource server may not even know all possibleclient_idvalues in advance.This change relaxes the default behavior of
AtJwtBuilderso that it validates only the presence of theclient_idclaim. A specific value can still be required by callingAtJwtBuilder#clientId(...), just as before.Relates to gh-18381