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CVE-2026-21589

Estado: Pendiente de análisisCrítica (9.3)—

This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents.

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In some configurations, there may be some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents.

CVSS

Probabilidad de explotación (EPSS)

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.

AV:N/PR:N/UI:N indica acceso remoto sin autenticación (T1190). Permite leer archivos arbitrarios del directorio raíz web (T1005) incluyendo potenciales datos sensibles (T1552), aunque sin enumeración de directorios.

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 ManagementLimit Access to Resource Over NetworkFilter Network TrafficUpdate SoftwareActive Directory ConfigurationVulnerability Scanning

Tecnologías afectadas (8)

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

Atlassian — Bamboo Data CenterAIAtlassian — Bitbucket Data CenterAIAtlassian — Confluence Data CenterAIAtlassian — Crowd Data CenterAIAtlassian — CrucibleAIAtlassian — FisheyeAIAtlassian — Jira Service Management Data CenterAIAtlassian — Jira Software Data CenterAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-21589",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21589",
          "role": "CISA Coordinator",
          "options": [
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              "automatable": "no"
            },
            {
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          "version": "2.0.3",
          "timestamp": "2026-10-06T18:08:49.205538Z"
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    "cvssMetricV40": [
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          "baseScore": 9.3,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/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",
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          "subIntegrityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "HIGH",
          "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"
        }
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    {
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      "affectedData": [
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          "versions": [
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            {
              "status": "unaffected",
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            {
              "status": "unaffected",
              "version": "Patch version 12.1.12 and later"
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        {
          "vendor": "Atlassian",
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            {
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            {
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            {
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              "version": "Patch version 7.2.4 and later"
            },
            {
              "status": "unaffected",
              "version": "Patch version 7.1.7 and later"
            },
            {
              "status": "unaffected",
              "version": "Patch version 7.0.3 and later"
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            {
              "status": "unaffected",
              "version": "Patch version 6.3.7 and later"
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        {
          "vendor": "Atlassian",
          "product": "Crucible Data Center",
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          "vendor": "Atlassian",
          "product": "Fisheye Data Center",
          "versions": [
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              "version": "All other versions"
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              "status": "unaffected",
              "version": "Patch version 4.9.15 and later"
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        },
        {
          "vendor": "Atlassian",
          "product": "Jira Service Management Data Center",
          "versions": [
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              "status": "affected",
              "version": "All other versions"
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              "status": "unaffected",
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            {
              "status": "unaffected",
              "version": "Patch version 10.3.26 and later"
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              "status": "unaffected",
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  ],
  "published": "2026-10-05T22:16:58.423",
  "references": [
    {
      "url": "https://jira.atlassian.com/browse/BAM-26567",
      "source": "security@atlassian.com"
    },
    {
      "url": "https://jira.atlassian.com/browse/BSERV-20604",
      "source": "security@atlassian.com"
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      "url": "https://jira.atlassian.com/browse/CONFSERVER-104488",
      "source": "security@atlassian.com"
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      "source": "security@atlassian.com"
    }
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      "description": [
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          "value": "CWE-552"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents."
    }
  ],
  "lastModified": "2026-10-06T19:18:14.447",
  "sourceIdentifier": "security@atlassian.com"
}