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    1 vulnerability by phpsysinfo

    CVE-2026-55584 (GCVE-0-2026-55584)

    Vulnerability from cvelistv5 – Published: 2026-08-28 18:29 – Updated: 2026-08-31 18:54
    VLAI
    Title
    phpSysInfo: IP allowlist (PSI_ALLOWED) bypass via spoofed X-Forwarded-For / Client-IP headers
    Summary
    phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSI_ALLOWED access-control check in read_config.php trusts attacker-controlled X-Forwarded-For and Client-IP HTTP headers before REMOTE_ADDR. A remote unauthenticated attacker can supply an allowed address in one of these headers to impersonate a trusted client and access exposed hostname, kernel, CPU, memory, filesystem, and network-interface information. This issue is fixed in version 3.4.6.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-31 15:42 UTC
    CWE
    • CWE-290 - Authentication Bypass by Spoofing
    Assigner
    GitHub_M CNA
    References
    Impacted products
    Vendor Product Version
    phpsysinfo phpsysinfo Affected: < 3.4.6
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
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            "other": {
              "content": {
                "id": "CVE-2026-55584",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "yes"
                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-08-31T15:42:20.334223Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-08-31T18:54:06.500Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        "title": "CISA ADP Vulnrichment"
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      "descriptions": [
        {
          "lang": "en",
          "value": "phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSI_ALLOWED access-control check in read_config.php trusts attacker-controlled X-Forwarded-For and Client-IP HTTP headers before REMOTE_ADDR. A remote unauthenticated attacker can supply an allowed address in one of these headers to impersonate a trusted client and access exposed hostname, kernel, CPU, memory, filesystem, and network-interface information. This issue is fixed in version 3.4.6."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-08-28T18:29:36.723Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      "references": [
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          "name": "https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh",
          "tags": [
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          ],
          "url": "https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh"
        },
        {
          "name": "https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab",
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          "url": "https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab"
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      "source": {
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        "discovery": "UNKNOWN"
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      "title": "phpSysInfo: IP allowlist (PSI_ALLOWED) bypass via spoofed X-Forwarded-For / Client-IP headers"
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    "dateReserved": "2026-06-16T23:18:03.169Z",
    "dateUpdated": "2026-08-31T18:54:06.500Z",
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