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CVE-2025-71403

better-auth before 1.1.20 Open Redirect via trustedOrigins Bypass

HIGH
7.1
CVSS Score
Published: August 1, 2026 at 12:22 PM UTC
Updated: October 6, 2026 at 10:10 PM UTC
2 products affected across 1 vendorBetter Auth /oauth ProviderAuth Better Auth

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Severity
HIGH7.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Better Auth /oauth Provider· Better Auth
95%
v < 1.1.20
Affected range stops below 1.1.20, so it looks safe — our inference, not a vendor statement
Auth Better Auth· Better Authnpm
60%
v < 1.1.20
Vendor states this is fixed in 1.1.20 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/better-auth/better-auth/security/advisories/GHSA-vp58-j275-797x
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/better-auth-before-open-redirect-via-trustedorigins-bypass

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-601

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