Vulnerability-Lookup

GHSA-7Q3G-GCCM-822Q

Vulnerability from github – Published: 2026-05-16 18:31 – Updated: 2026-05-16 18:31

Details

CouchCMS 2.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG files through the file upload functionality. Attackers can upload SVG files containing embedded script tags to the browse.php endpoint, which are then executed in users' browsers when the files are accessed or previewed.

Severity

5.4 (Medium)


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

5.1 (Medium)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47955"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-16T16:16:21Z",
    "severity": "MODERATE"
  },
  "details": "CouchCMS 2.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG files through the file upload functionality. Attackers can upload SVG files containing embedded script tags to the browse.php endpoint, which are then executed in users\u0027 browsers when the files are accessed or previewed.",
  "id": "GHSA-7q3g-gccm-822q",
  "modified": "2026-05-16T18:31:38Z",
  "published": "2026-05-16T18:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47955"
    },
    {
      "type": "WEB",
      "url": "https://github.com/CouchCMS/CouchCMS"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/49636"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/couchcms-cross-site-scripting-via-svg-file-upload"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/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-2021-47955 (GCVE-0-2021-47955)

Vulnerability from cvelistv5 – Published: 2026-05-16 15:26 – Updated: 2026-05-24 01:37

Title

CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload

Summary

Severity

5.1 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/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: poc 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

3 references

URL	Tags
https://www.exploit-db.com/exploits/49636	exploit
https://github.com/CouchCMS/CouchCMS	product
https://www.vulncheck.com/advisories/couchcms-cro…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
CouchCMS	CouchCMS	Affected: 2.2.1

Date Public

2021-01-25 00:00

Credits

xxcdd

Show details on NVD website

JSON

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                "id": "CVE-2021-47955",
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                  },
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                  },
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                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-05-18T17:24:03.456138Z",
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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-7Q3G-GCCM-822Q

CVE-2021-47955 (GCVE-0-2021-47955)

Tags

Sightings

Nomenclature