Vulnerability-Lookup

GHSA-FCWR-XG8X-PPC3

Vulnerability from github – Published: 2025-12-18 21:31 – Updated: 2025-12-18 21:31

Details

A stored cross-site scripting vulnerability in Kentico Xperience allows attackers to upload files with spoofed Content-Type that do not match file extensions. Attackers can exploit this vulnerability by uploading malicious files with manipulated MIME types, allowing malicious scripts to execute in users' browsers.

Severity

4.6 (Medium)


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

5.1 (Medium)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2020-36891"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-18T20:15:49Z",
    "severity": "MODERATE"
  },
  "details": "A stored cross-site scripting vulnerability in Kentico Xperience allows attackers to upload files with spoofed Content-Type that do not match file extensions. Attackers can exploit this vulnerability by uploading malicious files with manipulated MIME types, allowing malicious scripts to execute in users\u0027 browsers.",
  "id": "GHSA-fcwr-xg8x-ppc3",
  "modified": "2025-12-18T21:31:42Z",
  "published": "2025-12-18T21:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-36891"
    },
    {
      "type": "WEB",
      "url": "https://devnet.kentico.com/download/hotfixes"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/kentico-xperience-file-upload-stored-xss"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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-2020-36891 (GCVE-0-2020-36891)

Vulnerability from cvelistv5 – Published: 2025-12-18 19:53 – Updated: 2025-12-30 14:09

Title

Kentico Xperience <= 12.0.49 File Upload Stored XSS

Summary

Severity

5.1 (Medium)


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

5.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

VulnCheck

References

2 references

URL	Tags
https://devnet.kentico.com/download/hotfixes	vendor-advisorypatch
https://www.vulncheck.com/advisories/kentico-xper…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Kentico	Xperience	Affected: 0 , ≤ 12.0.49 (custom)

Date Public

2019-11-29 00:00

Credits

Ataberk Yavuzer

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2020-36891",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-18T21:08:55.081178Z",
                "version": "2.0.3"
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          "dateUpdated": "2025-12-18T21:48:14.482Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        }
      ],
      "metrics": [
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          "name": "Kentico DevNet Hotfixes",
          "tags": [
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        },
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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.

Action not permitted

GHSA-FCWR-XG8X-PPC3

CVE-2020-36891 (GCVE-0-2020-36891)

Tags

Sightings

Nomenclature