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CVE-2026-110862

9.1, critical

better-auth Improper Authentication Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.1, critical critical CVSS v3.1
EPSS, next 30 days
0.3% higher than 23.5% of scored CVEs
Exploitation
No public evidence
Published
14 Oct 20263 days ago

Description

Better Auth from 1.4.0-beta.18 before 1.7.7 contains an authentication bypass vulnerability that allows unauthenticated attackers to sign in as other users by reusing OAuth state values as Magic Link tokens. Attackers can start an OAuth sign-in with a victim's email and submit the returned state to Magic Link verification, gaining sessions or creating falsely email-verified accounts.

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:L/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-2026-110863 Better-auth sso Improper Authentication Vulnerability EPSS 0.3% 8.1, high
  • CVE-2026-110864 better-auth Improper Authentication Vulnerability EPSS 0.3% 7.4, 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-2026-110862 in your network?

This page tells you how dangerous CVE-2026-110862 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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    Find it before attackers do

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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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.