FKIE_CVE-2026-62317

Vulnerability from fkie_nvd - Published: 2026-08-19 20:17 - Updated: 2026-08-21 20:16
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's email subaddressing blocklist in packages/core/src/libraries/sign-in-experience/email-blocklist-policy.ts used the attacker-controlled domain from email input to construct subaddressingRegex when blockSubaddressing was enabled. The permissive emailRegEx accepted multiple at signs and regular expression metacharacters, and POST /api/experience/verification/verification-code could therefore cause catastrophic backtracking in subaddressingRegex.test(email). The resulting event-loop stall could make authentication, token issuance, SSO, and the administrative console unavailable. This issue is fixed in version 1.41.0.
References
security-advisories@github.comhttps://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547
security-advisories@github.comhttps://github.com/logto-io/logto/pull/9106
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-qp7j-c3q2-g739
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739
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 email subaddressing blocklist in packages/core/src/libraries/sign-in-experience/email-blocklist-policy.ts used the attacker-controlled domain from email input to construct subaddressingRegex when blockSubaddressing was enabled. The permissive emailRegEx accepted multiple at signs and regular expression metacharacters, and POST /api/experience/verification/verification-code could therefore cause catastrophic backtracking in subaddressingRegex.test(email). The resulting event-loop stall could make authentication, token issuance, SSO, and the administrative console unavailable. This issue is fixed in version 1.41.0."
    }
  ],
  "id": "CVE-2026-62317",
  "lastModified": "2026-08-21T20:16:38.243",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-62317",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-21T19:05:23.350390Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-19T20:17:19.890",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/pull/9106"
    },
    {
      "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-qp7j-c3q2-g739"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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