CVE-2026-55789 (GCVE-0-2026-55789)

Vulnerability from cvelistv5 – Published: 2026-07-10 19:55 – Updated: 2026-07-10 19:55
VLAI
Title
Logto: SAML IdP injects user-controlled profile attributes raw into signed assertions, allowing privilege escalation at relying Service Providers
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.
Severity
8.5 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
CWE
  • CWE-91 - XML Injection (aka Blind XPath Injection)
  • CWE-1395 - Dependency on Vulnerable Third-Party Component
Assigner
References
Impacted products
Vendor Product Version
logto-io logto Affected: < 1.41.0
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  "containers": {
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      "affected": [
        {
          "product": "logto",
          "vendor": "logto-io",
          "versions": [
            {
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            }
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          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
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            }
          ]
        },
        {
          "descriptions": [
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              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-10T19:55:37.360Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63",
          "tags": [
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          ],
          "url": "https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63"
        },
        {
          "name": "https://github.com/logto-io/logto/pull/9107",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/logto-io/logto/pull/9107"
        },
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          "name": "https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6"
        },
        {
          "name": "https://github.com/logto-io/logto/releases/tag/v1.41.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/logto-io/logto/releases/tag/v1.41.0"
        }
      ],
      "source": {
        "advisory": "GHSA-vfpw-vq44-4p63",
        "discovery": "UNKNOWN"
      },
      "title": "Logto: SAML IdP injects user-controlled profile attributes raw into signed assertions, allowing privilege escalation at relying Service Providers"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55789",
    "datePublished": "2026-07-10T19:55:37.360Z",
    "dateReserved": "2026-06-17T14:40:28.380Z",
    "dateUpdated": "2026-07-10T19:55:37.360Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-55789",
      "date": "2026-07-11",
      "epss": "0.00298",
      "percentile": "0.21635"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55789\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-10T20:16:47.933\",\"lastModified\":\"2026-07-10T20:16:47.933\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"logto-io\",\"product\":\"logto\",\"versions\":[{\"version\":\"\u003c 1.41.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N\",\"baseScore\":8.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.1,\"impactScore\":4.7}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-91\"}]}],\"references\":[{\"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\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.