CVE-2026-121802

Full vulnerability record from the local CVENow database.

Description

@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.

Severity

CRITICAL

CVSS score

9.1 (v3.1)

Vulnerability status

Deferred

Source identifier

[email protected]

Published

2026-11-04 03:17:15.730000

Last modified

2026-11-04 03:17:15.877000

View original CVE JSON

{
  "id": "CVE-2026-121802",
  "sourceIdentifier": "[email protected]",
  "published": "2026-11-04T03:17:15.730",
  "lastModified": "2026-11-04T03:17:15.877",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "better-auth",
          "product": "Better Auth",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/%40better-auth/expo",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.7.16",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-346"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/better-auth/better-auth/blob/main/packages/expo/CHANGELOG.md",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/better-auth/better-auth/releases/tag/v1.7.16",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-4wq4-2ppv-q3hg",
      "source": "[email protected]"
    }
  ]
}