FKIE_CVE-2026-41479

Vulnerability from fkie_nvd - Published: 2026-06-22 21:16 - Updated: 2026-06-26 20:10
Severity
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Summary
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.
References
security-advisories@github.comhttps://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab096Patch
security-advisories@github.comhttps://github.com/authlib/authlib/security/advisories/GHSA-w8p2-r796-3vmqExploit, Vendor Advisory
Impacted products
Vendor Product Version
authlib authlib *
authlib authlib 1.7.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "authlib",
          "vendor": "authlib",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.6.10"
            },
            {
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              "version": "= 1.7.0"
            }
          ]
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      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
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      "nodes": [
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          "cpeMatch": [
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              "criteria": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AD545CB1-0B23-4525-9346-4CCCD801CDE0",
              "versionEndExcluding": "1.6.10",
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              "matchCriteriaId": "23EF713E-4717-41F6-A5C2-26365D1A763A",
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          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib\u0027s OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1."
    }
  ],
  "id": "CVE-2026-41479",
  "lastModified": "2026-06-26T20:10:38.003",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "version": "3.1"
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        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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        "ssvcData": {
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          "options": [
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            {
              "technicalImpact": "partial"
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          "role": "CISA Coordinator",
          "timestamp": "2026-06-23T14:01:50.345168Z",
          "version": "2.0.3"
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  "published": "2026-06-22T21:16:24.017",
  "references": [
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      "tags": [
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      "url": "https://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab096"
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      "tags": [
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-601"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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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