AIKIDO-2026-10500
@better-auth/stripe is vulnerable to Prototype Pollution
73
High Risk
This Affects:
@better-auth/stripeTL;DR
The Stripe plugin merges developer and user-supplied Stripe metadata objects to attach internal identifiers on customers and subscriptions. When that merge used deep-merge semantics, attacker-controlled objects could supply special keys such as __proto__ that influence the merged object’s prototype chain. The change replaces the unsafe merge for flat metadata with an explicit loop that copies only string keys and skips reserved prototype-related keys, then applies internal fields last so trusted values win.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
@better-auth/stripe is vulnerable to Prototype Pollution in versions 1.5.0 - 1.6.2.
How to fix this
Upgrade the @better-auth/stripe library to the patch version.
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