CVE-2026-55584

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Source
https://cve.org/CVERecord?id=CVE-2026-55584
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55584.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55584
Aliases
Downstream
Published
2026-08-28T18:29:36.723Z
Modified
2026-08-30T03:46:55.657965382Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
phpSysInfo: IP allowlist (PSI_ALLOWED) bypass via spoofed X-Forwarded-For / Client-IP headers
Details

phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSIALLOWED access-control check in readconfig.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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55584.json",
    "cwe_ids": [
        "CWE-290"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/phpsysinfo/phpsysinfo

Affected ranges

Type
GIT
Repo
https://github.com/phpsysinfo/phpsysinfo
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
019fa2d7e568ea11461adb4bd33da5dc87c4b9ab
Fixed
5cca50ecc7bcbdcd769af42961dff2a800dc7ea6
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.4.6"
        }
    ]
}

Affected versions

v3.*
v3.1.0
v3.1.1
v3.1.10
v3.1.11
v3.1.12
v3.1.13
v3.1.14
v3.1.15
v3.1.16
v3.1.17
v3.1.2
v3.1.3
v3.1.4
v3.1.5
v3.1.6
v3.1.7
v3.1.8
v3.1.9
v3.2.0
v3.2.1
v3.2.10
v3.2.2
v3.2.3
v3.2.4
v3.2.5
v3.2.6
v3.2.7
v3.2.8
v3.2.9
v3.3.0
v3.3.1
v3.3.2
v3.3.3
v3.3.4
v3.4.0
v3.4.1
v3.4.2
v3.4.3
v3.4.4
v3.4.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55584.json"