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CVE-2026-110864

7.4, high

better-auth Improper Authentication Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.4, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 19.9% of scored CVEs
Exploitation
No public evidence
Published
14 Oct 20264 days ago

Description

Better Auth from 1.5.0-beta.12 before 1.7.7 contains an authentication bypass vulnerability in the OAuth Proxy plugin that allows unauthenticated attackers to sign in as other users by forging encrypted profiles. When the proxy shares the global secret and cookie-stored state is used, attackers can obtain encrypted state for a fake profile with a victim's verified email to take over the account via implicit linking.

Details

Vendor
Better-auth
Product
better-auth
Weakness
CWE-287 (opens in a new tab)
Status
Received
Updated
14 Oct 2026
Assigner
disclosure@vulncheck.com

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

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Better-auth CVEs

Every Better-auth CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-110862 better-auth Improper Authentication Vulnerability EPSS 0.3% 9.1, critical
  • CVE-2026-110863 Better-auth sso Improper Authentication Vulnerability EPSS 0.3% 8.1, high
  • CVE-2026-109346 better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin because… EPSS 0.3% 8.1, high

Beyond this page

Is CVE-2026-110864 in your network?

This page tells you how dangerous CVE-2026-110864 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.