CVE-1999-1076

Status: ModifiedMedium (4.6)—

Idle locking function in MacOS 9 allows local users to bypass the password protection of idled sessions by selecting the "Log Out" option and selecting a "Cancel" option in the dialog box for an application that attempts to verify that the user wants to log out, which returns the attacker into the locked session.

CVSS

Version: 2.0
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P
Base score: 4.6

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.45%
Percentile among all scored CVEs: 37
Score date: 10/13/2026

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).

Affected technologies (1)

Apple — Macos

CWEs

NVD-CWE-Other

References

Raw JSON (NVD)

Show

{
  "id": "CVE-1999-1076",
  "cveTags": [],
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          "baseScore": 4.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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  "affected": [
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      "affectedData": [
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          "versions": [
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              "status": "affected",
              "version": "n/a"
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  ],
  "published": "1999-10-26T04:00:00.000",
  "references": [
    {
      "url": "http://marc.info/?l=bugtraq&m=94096348604173&w=2",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/745",
      "tags": [
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        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://marc.info/?l=bugtraq&m=94096348604173&w=2",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/745",
      "tags": [
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        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "NVD-CWE-Other"
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    {
      "lang": "en",
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    }
  ],
  "lastModified": "2026-06-16T21:49:40.277",
  "configurations": [
    {
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  "sourceIdentifier": "cve@mitre.org"
}