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FKIE_CVE-2026-55578

Vulnerability from fkie_nvd - Published: 2026-07-27 18:16 - Updated: 2026-07-28 15:17
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Pheditor is a single-file editor and file manager written in PHP. From version 2.0.1 to before version 2.0.6, the terminal feature in Pheditor uses an incomplete character blocklist to sanitize user-supplied commands before passing them to shell_exec(). After the fix for GHSA-9643-6xjp-vx57 (which added $ to the blocklist), the characters | (single pipe), ` (backtick), and the newline byte (0x0A) remain unblocked. An authenticated user with the terminal permission (enabled by default) can leverage any of these to bypass the TERMINAL_COMMANDS allowlist and execute arbitrary OS commands as the web server user. This issue has been patched in version 2.0.6.
References
security-advisories@github.comhttps://github.com/advisories/GHSA-9643-6xjp-vx57
security-advisories@github.comhttps://github.com/pheditor/pheditor/releases/tag/2.0.6
security-advisories@github.comhttps://github.com/pheditor/pheditor/security/advisories/GHSA-wg4w-wr5q-6vjc
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/pheditor/pheditor/security/advisories/GHSA-wg4w-wr5q-6vjc
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "pheditor",
          "vendor": "pheditor",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.1, \u003c 2.0.6"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Pheditor is a single-file editor and file manager written in PHP. From version 2.0.1 to before version 2.0.6, the terminal feature in Pheditor uses an incomplete character blocklist to sanitize user-supplied commands before passing them to shell_exec(). After the fix for GHSA-9643-6xjp-vx57 (which added $ to the blocklist), the characters | (single pipe), ` (backtick), and the newline byte (0x0A) remain unblocked. An authenticated user with the terminal permission (enabled by default) can leverage any of these to bypass the TERMINAL_COMMANDS allowlist and execute arbitrary OS commands as the web server user. This issue has been patched in version 2.0.6."
    }
  ],
  "id": "CVE-2026-55578",
  "lastModified": "2026-07-28T15:17:19.233",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55578",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-28T14:03:49.769768Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-27T18:16:56.730",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/advisories/GHSA-9643-6xjp-vx57"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pheditor/pheditor/releases/tag/2.0.6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pheditor/pheditor/security/advisories/GHSA-wg4w-wr5q-6vjc"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/pheditor/pheditor/security/advisories/GHSA-wg4w-wr5q-6vjc"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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