CVE-2026-87423

Status: Awaiting AnalysisMedium (4.5)—

Severity4.5Medium · CVSS 3.1

Exploitation probability0.10 %higher than 1% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

Vulnerability in the Oracle Solaris product of Oracle Systems (component: X Window System). The supported version that is affected is 11.4. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Solaris accessible data as well as unauthorized read access to a subset of Oracle Solaris accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Solaris. CVSS 3.1 Base Score 4.5 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L).

CVSS

Base score: 4.5
Version: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.10 %
Percentile among all scored CVEs: 1
Score date: 10/22/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Primary impactT1565 Data Manipulationimpact80 %
Secondary impactT1005 Data from Local Systemcollection75 %
Secondary impactT1499 Endpoint Denial of Serviceimpact65 %

Vector AV:L, PR:L y UI:N indica escalada local; el texto describe modificación y lectura de datos accesibles y una denegación de servicio parcial en Solaris 11.4.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Threat Intelligence Program Restrict File and Directory Permissions Remote Data Storage Network Segmentation Filter Network Traffic Execution Prevention

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Oracle — Solaris^AI

CWEs

CWE-269

References

Show 1 references

https://www.oracle.com/security-alerts/cpuoct2026.html

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-87423",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-87423",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-21T14:17:10.109239Z"
        }
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    "cvssMetricV31": [
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          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
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        "exploitabilityScore": 1
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  "affected": [
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      "source": "secalert_us@oracle.com",
      "affectedData": [
        {
          "vendor": "Oracle Corporation",
          "product": "Oracle Solaris",
          "versions": [
            {
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              "version": "11.4",
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  "published": "2026-10-20T22:20:20.857",
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      "value": "Vulnerability in the Oracle Solaris product of Oracle Systems (component: X Window System).   The supported version that is affected is 11.4. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Oracle Solaris accessible data as well as  unauthorized read access to a subset of Oracle Solaris accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Solaris. CVSS 3.1 Base Score 4.5 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L)."
    }
  ],
  "lastModified": "2026-10-21T18:45:11.277",
  "sourceIdentifier": "secalert_us@oracle.com"
}