Mitigate REST API cache poisoning via Method Override#1556
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swalkinshaw merged 1 commit intoroots:masterfrom Jan 27, 2025
AltanS:master
Merged
Mitigate REST API cache poisoning via Method Override#1556swalkinshaw merged 1 commit intoroots:masterfrom AltanS:master
swalkinshaw merged 1 commit intoroots:masterfrom
AltanS:master
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retlehs
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Jan 23, 2025
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retlehs
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Appreciate both the PR and the background. This is a nice update — thank you!
tangrufus
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Jan 27, 2025
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Thank you! |
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Assuming a website chooses to cache responses for specific API routes in the WP REST API (like /wp-json/wp/v2/posts). An attacker could use the
X-HTTP-Method-Overrideheader to request an endpoint (i.e. /wp/v2/posts/1) until the cache isSTALEand trigger an update of the cache from the response that served the HEAD request instead of the GET request. The endpoint would then return an empty response body.Normal routes are not affected by this, but since WP allows method overrides against the REST API, this could become an issue for headless WP instances.