Vulnerability-Lookup

GHSA-46J6-W3HW-4R9X

Vulnerability from github – Published: 2026-09-01 21:31 – Updated: 2026-09-01 21:31

Details

Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-71981"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-01T21:18:36Z",
    "severity": "HIGH"
  },
  "details": "Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.",
  "id": "GHSA-46j6-w3hw-4r9x",
  "modified": "2026-09-01T21:31:50Z",
  "published": "2026-09-01T21:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71981"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cypht-org/cypht/pull/2073"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cypht-org/cypht/releases/tag/v2.12.2"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-71981 (GCVE-0-2026-71981)

Vulnerability from cvelistv5 – Published: 2026-09-01 20:43 – Updated: 2026-09-02 14:52 X_Open Source

Title

Cypht < 2.12.2 PHP Object Injection RCE via back_query Parameter

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 14:52 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/cypht-org/cypht/releases/tag/v2.12.2	release-notes
https://github.com/cypht-org/cypht/pull/2073	issue-tracking
https://github.com/cypht-org/cypht/commit/e4aa2f3…	patch
https://www.vulncheck.com/advisories/cypht-php-ob…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
cypht-org	cypht	Affected: 0 , < 2.12.2 (semver)

Date Public

2026-08-16 00:00

Credits

Adam Młynarczyk

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-71981",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T14:52:41.224173Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-02T14:52:48.434Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "affected",
          "packageURL": "pkg:github/cypht-org/cypht",
          "product": "cypht",
          "repo": "https://github.com/cypht-org/cypht",
          "vendor": "cypht-org",
          "versions": [
            {
              "lessThan": "2.12.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Adam M\u0142ynarczyk"
        }
      ],
      "datePublic": "2026-08-16T00:00:00.000Z",
      "descriptions": [
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          "lang": "en",
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        }
      ],
      "metrics": [
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          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
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            "providerUrgency": "NOT_DEFINED",
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            "subConfidentialityImpact": "NONE",
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            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "format": "CVSS",
          "scenarios": [
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            "attackComplexity": "LOW",
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      "providerMetadata": {
        "dateUpdated": "2026-09-01T20:43:08.844Z",
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      },
      "references": [
        {
          "name": "Release Notes",
          "tags": [
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          ],
          "url": "https://github.com/cypht-org/cypht/releases/tag/v2.12.2"
        },
        {
          "name": "Pull Request",
          "tags": [
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          ],
          "url": "https://github.com/cypht-org/cypht/pull/2073"
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        },
        {
          "tags": [
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          "url": "https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "tags": [
        "x_open-source"
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      "title": "Cypht \u003c 2.12.2 PHP Object Injection RCE via back_query Parameter",
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-71981",
    "datePublished": "2026-09-01T20:43:08.844Z",
    "dateReserved": "2026-08-08T16:43:04.179Z",
    "dateUpdated": "2026-09-02T14:52:48.434Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-46J6-W3HW-4R9X

CVE-2026-71981 (GCVE-0-2026-71981)

Tags

Sightings

Nomenclature