---
id: CVE-2026-108157
title: >-
  Pingvin Share X from 0.19.0 before 1.22.0 contains an improper authentication
  vulnerability that allows remote unauthenticated attackers to take over
  accounts by abusing automatic OAuth email linking in OAuthService.signUp()
summary: >-
  Pingvin Share X from 0.19.0 before 1.22.0 contains an improper authentication
  vulnerability that allows remote unauthenticated attackers to take over
  accounts by abusing automatic OAuth email linking in OAuthService.signUp().
  Attackers c…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T18:17:07.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108157'
references:
  - url: 'https://github.com/smp46/pingvin-share-x'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/smp46/pingvin-share-x/blob/de7ffecf9bfc4976993149a5c4c98efe35161424/backend/src/oauth/oauth.service.ts#L158-L175
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/smp46/pingvin-share-x/commit/07aa8c0a96030c439e9018ce94a2778bd37304e6
    label: disclosure@vulncheck.com
  - url: 'https://github.com/smp46/pingvin-share-x/releases/tag/v1.22.0'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/smp46/pingvin-share-x/security/advisories/GHSA-wrcg-4874-45p7
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pingvin-share-x-0.19.0-before-1.22.0-account-takeover-via-oauth-email-linking
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-09T18:07:39.417Z'
---

## Overview

Pingvin Share X from 0.19.0 before 1.22.0 contains an improper authentication vulnerability that allows remote unauthenticated attackers to take over accounts by abusing automatic OAuth email linking in OAuthService.signUp(). Attackers can register a victim's unverified email on an enabled OAuth/OIDC provider, exploiting the missing email_verified check in GenericOidcProvider, to sign in as the victim including administrators while bypassing TOTP.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.