CVE-2026-53431

Estado: AplazadaCrítica (9.1)—

Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion to authenticate as the issuing OAuth client after the assertion has expired.

Boruta accepts JWT-based client authentication (client_secret_jwt and private_key_jwt token endpoint authentication methods) but never enforces that the assertion's exp claim is in the future.

Leer descripción completaMostrar menos

The pre-check helper Boruta.Oauth.Request.Base.check_expiration/1 in lib/boruta/oauth/request/base.ex only verifies that an exp claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, Boruta.Oauth.Authorization.Client.Token.token_config/0 in lib/boruta/oauth/authorization/client.ex, returns an empty map, so Joken's default exp claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges.

This issue affects boruta: from 2.3.0 before 2.3.7.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 9.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.70%
Percentil entre todas las CVEs puntuadas: 52
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %
Impacto principalT1078.004 Cloud Accountsstealth · persistence · privilege escalation · initial access85 %
Impacto secundarioT1550.001 Application Access Tokenlateral movement80 %

Vulnerabilidad de OAuth en servicio remoto accesible sin privilegios (AV:N/PR:N). Atacante obtiene aserción JWT válida y la reproduce para autenticarse como cliente OAuth, obteniendo tokens de acceso con privilegios del cliente.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account Management Account Use Policies Application Developer Guidance Active Directory Configuration Vulnerability Scanning User Training

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Malach-it — Boruta^AI

CWE

CWE-294

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-53431",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-53431",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-30T16:12:55.290055Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 9.1,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:malach-it:boruta_auth:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/malach-it/boruta_auth",
          "vendor": "malach-it",
          "modules": [
            "'Elixir.Boruta.Oauth.Request.Base'",
            "'Elixir.Boruta.Oauth.Authorization.Client.Token'"
          ],
          "product": "boruta",
          "versions": [
            {
              "status": "affected",
              "version": "2.3.0",
              "lessThan": "2.3.7",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:hex/boruta",
          "packageName": "boruta",
          "programFiles": [
            "lib/boruta/oauth/request/base.ex",
            "lib/boruta/oauth/authorization/client.ex"
          ],
          "collectionURL": "https://repo.hex.pm",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.Boruta.Oauth.Request.Base':fetch_client_authentication/1"
            },
            {
              "name": "'Elixir.Boruta.Oauth.Request.Base':check_expiration/1"
            },
            {
              "name": "'Elixir.Boruta.Oauth.Authorization.Client.Token':token_config/0"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:malach-it:boruta_auth:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/malach-it/boruta_auth",
          "vendor": "malach-it",
          "modules": [
            "'Elixir.Boruta.Oauth.Request.Base'",
            "'Elixir.Boruta.Oauth.Authorization.Client.Token'"
          ],
          "product": "boruta",
          "versions": [
            {
              "status": "affected",
              "changes": [
                {
                  "at": "5204f88f9b2cdd9637a755337ed5f99185be5474",
                  "status": "unaffected"
                },
                {
                  "at": "69363432aa36760fc5438e4e17115d0f7c1b925a",
                  "status": "unaffected"
                }
              ],
              "version": "5bfbe1c5443bffe71cf1bf954bbdff61327d9a83",
              "lessThan": "*",
              "versionType": "git"
            }
          ],
          "packageURL": "pkg:github/malach-it/boruta_auth",
          "packageName": "malach-it/boruta_auth",
          "programFiles": [
            "lib/boruta/oauth/request/base.ex",
            "lib/boruta/oauth/authorization/client.ex"
          ],
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.Boruta.Oauth.Request.Base':fetch_client_authentication/1"
            },
            {
              "name": "'Elixir.Boruta.Oauth.Request.Base':check_expiration/1"
            },
            {
              "name": "'Elixir.Boruta.Oauth.Authorization.Client.Token':token_config/0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-07-30T15:16:33.567",
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-53431.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/malach-it/boruta_auth/commit/5204f88f9b2cdd9637a755337ed5f99185be5474",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/malach-it/boruta_auth/commit/69363432aa36760fc5438e4e17115d0f7c1b925a",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/malach-it/boruta_auth/security/advisories/GHSA-xjv8-vmh5-xhf6",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-53431",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/malach-it/boruta_auth/security/advisories/GHSA-xjv8-vmh5-xhf6",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
        {
          "lang": "en",
          "value": "CWE-294"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion to authenticate as the issuing OAuth client after the assertion has expired.\n\nBoruta accepts JWT-based client authentication (client_secret_jwt and private_key_jwt token endpoint authentication methods) but never enforces that the assertion's exp claim is in the future. The pre-check helper Boruta.Oauth.Request.Base.check_expiration/1 in lib/boruta/oauth/request/base.ex only verifies that an exp claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, Boruta.Oauth.Authorization.Client.Token.token_config/0 in lib/boruta/oauth/authorization/client.ex, returns an empty map, so Joken's default exp claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges.\n\nThis issue affects boruta: from 2.3.0 before 2.3.7."
    }
  ],
  "lastModified": "2026-07-30T17:16:32.863",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}