Vulnerability-Lookup

GHSA-8M8X-W498-P4WX

Vulnerability from github – Published: 2026-04-07 21:32 – Updated: 2026-04-16 00:54

Details

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows XSS Targeting Non-Script Elements.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

Severity ?

6.1 (Medium)


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

5.1 (Medium)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-39840"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-07T20:16:33Z",
    "severity": "MODERATE"
  },
  "details": "Improper neutralization of input during web page generation (\u0027cross-site scripting\u0027) vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows XSS Targeting Non-Script Elements.This issue affects Mediawiki - Cargo Extension: before 3.8.7.",
  "id": "GHSA-8m8x-w498-p4wx",
  "modified": "2026-04-16T00:54:04Z",
  "published": "2026-04-07T21:32:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39840"
    },
    {
      "type": "WEB",
      "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237966"
    },
    {
      "type": "WEB",
      "url": "https://phabricator.wikimedia.org/T416368"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/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-2026-39840 (GCVE-0-2026-39840)

Vulnerability from cvelistv5 – Published: 2026-04-07 19:35 – Updated: 2026-04-07 20:42

Title

CSS injection in multiple Cargo display formats

Summary

Severity ?

5.1 (Medium)


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

CWE

CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')

Assigner

wikimedia-foundation

References

URL

Tags

	https://phabricator.wikimedia.org/T416368
	https://gerrit.wikimedia.org/r/c/mediawiki/extens…

Impacted products

	Vendor	Product	Version
	Wikimedia Foundation	Mediawiki - Cargo Extension	Affected: 0 , < 3.8.7 (custom)

Credits

SomeRandomDeveloper Yaron Koren

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39840",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-07T20:32:58.690563Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-07T20:42:42.943Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Mediawiki - Cargo Extension",
          "vendor": "Wikimedia Foundation",
          "versions": [
            {
              "lessThan": "3.8.7",
              "status": "affected",
              "version": "0",
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            }
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        }
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          "type": "finder",
          "value": "SomeRandomDeveloper"
        },
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          "type": "remediation developer",
          "value": "Yaron Koren"
        }
      ],
      "descriptions": [
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          "supportingMedia": [
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              "type": "text/html",
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            }
          ],
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      ],
      "impacts": [
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          "descriptions": [
            {
              "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",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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      "providerMetadata": {
        "dateUpdated": "2026-04-07T20:01:41.636Z",
        "orgId": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc",
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      "references": [
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          "url": "https://phabricator.wikimedia.org/T416368"
        },
        {
          "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237966"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CSS injection in multiple Cargo display formats",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
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  },
  "cveMetadata": {
    "assignerOrgId": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc",
    "assignerShortName": "wikimedia-foundation",
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    "datePublished": "2026-04-07T19:35:36.153Z",
    "dateReserved": "2026-04-07T18:21:12.573Z",
    "dateUpdated": "2026-04-07T20:42:42.943Z",
    "state": "PUBLISHED"
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Sightings

Author	Source	Type	Date

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-8M8X-W498-P4WX

CVE-2026-39840 (GCVE-0-2026-39840)

Tags

Sightings

Nomenclature