Vulnerability-Lookup

GHSA-C4W7-7M72-Q5M9

Vulnerability from github – Published: 2026-09-30 18:33 – Updated: 2026-09-30 18:33

Details

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki ReadingLists extension allows Reflected XSS.

This issue affects MediaWiki ReadingLists extension: 1.46 and 1.45.

Severity

1.1 (Low)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/S:N/AU:Y/R:U/V:D/RE:M/U:Amber

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{
  "affected": [],
  "aliases": [
    "CVE-2026-103437"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-80"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-30T18:18:16Z",
    "severity": "LOW"
  },
  "details": "Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki ReadingLists extension allows Reflected XSS.\n\nThis issue affects MediaWiki ReadingLists extension: 1.46 and 1.45.",
  "id": "GHSA-c4w7-7m72-q5m9",
  "modified": "2026-09-30T18:33:50Z",
  "published": "2026-09-30T18:33:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103437"
    },
    {
      "type": "WEB",
      "url": "https://gerrit.wikimedia.org/r/q/I9a724c05b2a55845007512422362e02ed8cf44b0"
    },
    {
      "type": "WEB",
      "url": "https://phabricator.wikimedia.org/T435863"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/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:N/AU:Y/R:U/V:D/RE:M/U:Amber",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-103437 (GCVE-0-2026-103437)

Vulnerability from cvelistv5 – Published: 2026-09-30 17:17 – Updated: 2026-09-30 20:01

Title

ReadingLists imported metadata permits JavaScript URL XSS

Summary

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki ReadingLists extension allows Reflected XSS. This issue affects MediaWiki ReadingLists extension: 1.46 and 1.45.

Severity

1.1 (Low)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/S:N/AU:Y/R:U/V:D/RE:M/U:Amber

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-30 18:12 UTC

CWE

CWE-80 - Improper neutralization of Script-Related HTML tags in a web page (basic XSS)

Assigner

wikimedia-foundation mitre root Scorecard

References

2 references

URL	Tags
https://phabricator.wikimedia.org/T435863
https://gerrit.wikimedia.org/r/q/I9a724c05b2a5584…

Impacted products

1 product

Vendor	Product	Version
The Wikimedia Foundation	MediaWiki ReadingLists extension	Affected: 1.46 Affected: 1.45

Credits

Marco Paciaroni (BomboBombone)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-103437",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-30T18:12:22.734768Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-30T20:01:02.016Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "MediaWiki ReadingLists extension",
          "repo": "https://gerrit.wikimedia.org/r/mediawiki/extensions/ReadingLists",
          "vendor": "The Wikimedia Foundation",
          "versions": [
            {
              "status": "affected",
              "version": "1.46"
            },
            {
              "status": "affected",
              "version": "1.45"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Marco Paciaroni (BomboBombone)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki ReadingLists extension allows Reflected XSS.\u003cp\u003eThis issue affects MediaWiki ReadingLists extension: 1.46 and 1.45.\u003c/p\u003e"
            }
          ],
          "value": "Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki ReadingLists extension allows Reflected XSS.\n\nThis issue affects MediaWiki ReadingLists extension: 1.46 and 1.45."
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      ],
      "impacts": [
        {
          "capecId": "CAPEC-591",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-591 Reflected XSS"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "USER",
            "Safety": "NEGLIGIBLE",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 1.1,
            "baseSeverity": "LOW",
            "exploitMaturity": "PROOF_OF_CONCEPT",
            "privilegesRequired": "LOW",
            "providerUrgency": "AMBER",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "ACTIVE",
            "valueDensity": "DIFFUSE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/S:N/AU:Y/R:U/V:D/RE:M/U:Amber",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "MODERATE"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
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      "problemTypes": [
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          "descriptions": [
            {
              "cweId": "CWE-80",
              "description": "CWE-80 Improper neutralization of Script-Related HTML tags in a web page (basic XSS)",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-09-30T17:17:35.540Z",
        "orgId": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc",
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      },
      "references": [
        {
          "url": "https://phabricator.wikimedia.org/T435863"
        },
        {
          "url": "https://gerrit.wikimedia.org/r/q/I9a724c05b2a55845007512422362e02ed8cf44b0"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "ReadingLists imported metadata permits JavaScript URL XSS",
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc",
    "assignerShortName": "wikimedia-foundation",
    "cveId": "CVE-2026-103437",
    "datePublished": "2026-09-30T17:17:35.540Z",
    "dateReserved": "2026-09-30T15:41:01.269Z",
    "dateUpdated": "2026-09-30T20:01:02.016Z",
    "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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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GHSA-C4W7-7M72-Q5M9

CVE-2026-103437 (GCVE-0-2026-103437)

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Sightings

Nomenclature

Related by attack behaviour