FKIE_CVE-2026-55789

Vulnerability from fkie_nvd - Published: 2026-07-10 20:16 - Updated: 2026-07-10 20:16
Severity
8.5 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Summary
Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes such as name, email, and custom attribute-mapping values into element-text placeholders of a SAML XML template using samlify 2.10.0, which left those placeholders unescaped. An authenticated low-privilege user could place XML markup in a profile attribute so Logto signed a forged SAML attribute, such as an arbitrary role, allowing privilege escalation at relying Service Providers that authorize on SAML attributes. This issue is fixed in version 1.41.0.
References
security-advisories@github.comhttps://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6
security-advisories@github.comhttps://github.com/logto-io/logto/pull/9107
security-advisories@github.comhttps://github.com/logto-io/logto/releases/tag/v1.41.0
security-advisories@github.comhttps://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "logto",
          "vendor": "logto-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.41.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto\u0027s self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes such as name, email, and custom attribute-mapping values into element-text placeholders of a SAML XML template using samlify 2.10.0, which left those placeholders unescaped. An authenticated low-privilege user could place XML markup in a profile attribute so Logto signed a forged SAML attribute, such as an arbitrary role, allowing privilege escalation at relying Service Providers that authorize on SAML attributes. This issue is fixed in version 1.41.0."
    }
  ],
  "id": "CVE-2026-55789",
  "lastModified": "2026-07-10T20:16:47.933",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 4.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-10T20:16:47.933",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/pull/9107"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/releases/tag/v1.41.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-91"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}



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