What is the CVSS score of CVE-2026-53515?

CVE-2026-53515 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N. EPSS exploitation probability: 0.2%.

Is there a patch available for CVE-2026-53515?

Yes, a patch is available for CVE-2026-53515. Update the affected software to the latest version immediately.

Better Auth CVE-2026-53515

EUVD-2026-44740 HIGH

Improper Privilege Management (CWE-269)

2026-07-15 GitHub_M

GHSA-gv74-j8m3-fg5f

Privilege Escalation Better Auth Sso

7.1

CVSS 3.1 · Vendor: GitHub_M

View

Vulnerability Assessment

Weakness

CWE

CWE-269

OWASP Top 10:2025

A06:2025 - Insecure Design

ASVS 5.0

V8 - Authorization Least privilege enforcement

MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 27, 2026

Privilege escalation in Better Auth SSO plugin (1.2.10 to <1.6.11) allows any authenticated organization member to register an attacker-controlled OIDC or SAML identity provider for the organization, bypassing the admin role check. This can be exploited to inject a malicious IdP and, through downstream SSO callback provisioning, add users to the target organization, potentially with elevated privileges if the default role is admin. The vulnerability is fixed in version 1.6.11; no active exploitation is currently reported but a public exploit is possible given the clear advisory details.

Affected VersionsENISA

better-auth 1.2.10, < 1.6.11

sso 1.2.10, < 1.6.11

Affected Packages

npm @better-auth/sso fix: 1.6.11

euvd better_auth_1_2_10 fix: 1.6.11

euvd sso_1_2_10 fix: 1.6.11

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 3 packages in npm, euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (GitHub_M) PRIMARY 7.1 HIGH

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

vuln.today AI 7.1 HIGH

Network endpoint reachable by any authenticated org member (PR:L), no UI or added complexity; registering a rogue provider is a high-integrity change with limited confidentiality and no availability impact.

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

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

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Lifecycle Timeline

Patch available

Jul 15, 2026 - 21:18 EUVD

CVE Published

Jul 15, 2026 - 17:27 cve.org

HIGH 7.1

DescriptionCVE.org

Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.

Threat Intelligence Overview

EPSS Score

0.2%

Top 85% exploitable

Threat Intel

1 sources

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment GHSA

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

Human Impact· derived

Medium

Technical Impact

Partial

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +36

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.