CVE-2025-71403

better-auth versions before 1.1.20 contain a bypass vulnerability in trustedOrigins validation logic affecting absolute URLs and wildcard domains. Attackers can construct malicious callbackURL parameters that pass origin checks and trigger open redirects to steal sensitive tokens for account takeover.

CVSS 4.0

7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

7.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-25)

CWE

CWE-601

Published

2026-08-01

Modified

2026-10-06

Record from

the NVD, synced 2026-10-19

Packages (OSV)

References

• https://github.com/better-auth/better-auth/security/advisories/GHSA-vp58-j275-797x
• https://www.vulncheck.com/advisories/better-auth-before-open-redirect-via-trustedorigins-bypass

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