FKIE_CVE-2026-53517

Vulnerability from fkie_nvd - Published: 2026-07-15 18:16 - Updated: 2026-07-21 16:00
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
Better Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint on the refresh_token grant performs a non-atomic read, validate, revoke, and mint sequence on the oauthRefreshToken row, allowing concurrent requests with the same parent refresh token to pass the revoked check and create forked refresh-token families; the vulnerable range also includes embedded better-auth plugin versions before 1.6.0. This issue is fixed in version 1.6.11.
References
security-advisories@github.comhttps://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52dPatch
security-advisories@github.comhttps://github.com/better-auth/better-auth/releases/tag/v1.6.11Release Notes
security-advisories@github.comhttps://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
better-auth better-auth\/oauth-provider *
better-auth better_auth *
better-auth better_auth 1.4.8
better-auth better_auth 1.4.8
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "better-auth",
          "vendor": "better-auth",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.4.8-beta.7, \u003c 1.6.0"
            }
          ]
        },
        {
          "product": "oauth-provider",
          "vendor": "@better-auth",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.6.0, \u003c 1.6.11"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:better-auth:better-auth\\/oauth-provider:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "1CF0531C-8739-41D0-96F5-9A19A04F2E19",
              "versionEndExcluding": "1.6.11",
              "versionStartIncluding": "1.6.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "B5552846-37CD-440F-A3F5-51DC4192ECF3",
              "versionEndExcluding": "1.6.11",
              "versionStartIncluding": "1.4.9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:better-auth:better_auth:1.4.8:-:*:*:*:node.js:*:*",
              "matchCriteriaId": "9DEBDFBD-94A3-4E7A-837C-6761070F416D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:better-auth:better_auth:1.4.8:beta7:*:*:*:node.js:*:*",
              "matchCriteriaId": "44F50292-6720-45F7-8100-DC80201A6DD5",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Better Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint on the refresh_token grant performs a non-atomic read, validate, revoke, and mint sequence on the oauthRefreshToken row, allowing concurrent requests with the same parent refresh token to pass the revoked check and create forked refresh-token families; the vulnerable range also includes embedded better-auth plugin versions before 1.6.0. This issue is fixed in version 1.6.11."
    }
  ],
  "id": "CVE-2026-53517",
  "lastModified": "2026-07-21T16:00:22.173",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-53517",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T19:20:42.640935Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-15T18:16:48.107",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52d"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/better-auth/better-auth/releases/tag/v1.6.11"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        },
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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