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GHSA-9x4v-xfq5-m8x5: Better Auth URL parameter HTML Injection (Reflected Cross-Site scripting)

February 5, 2025 (updated December 9, 2025)

The better-auth /api/auth/error page was vulnerable to HTML injection, resulting in a reflected cross-site scripting (XSS) vulnerability.

References

  • github.com/advisories/GHSA-9x4v-xfq5-m8x5
  • github.com/better-auth/better-auth
  • github.com/better-auth/better-auth/blob/05ada0b79dbcac93cc04ceb79b23ca598d07830c/packages/better-auth/src/api/routes/error.ts
  • github.com/better-auth/better-auth/commit/7ae340e2eddad641b7e43d24d37c58a66ce9ddcf
  • github.com/better-auth/better-auth/security/advisories/GHSA-9x4v-xfq5-m8x5

Code Behaviors & Features

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Affected versions

All versions starting from 0.0.2 before 1.1.16

Fixed versions

  • 1.1.16

Solution

Upgrade to version 1.1.16 or above.

Impact 5.4 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

npm/better-auth/GHSA-9x4v-xfq5-m8x5.yml

Spotted a mistake? Edit the file on GitLab.

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