Vulnerability-Lookup

GHSA-7XV3-GF2G-498H

Vulnerability from github – Published: 2026-09-18 16:50 – Updated: 2026-09-18 16:50

Summary

Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS

Details

Failure mode

sep was inserted verbatim into the HTML that joins a table cell's values. This made it possible to inject HTML through the separator value. The same unsanitised table HTML is produced both for the standard Special:Ask render and for its raw request output (request_type=raw), so the injection was reachable without authentication.

Remediation

In all non-wiki output modes (HTML, raw request, file), sep is escaped unless it is a safe <br> variant.
This preserves legitimate line-break separators while blocking markup injection.

Maintenance note

If the table renderer ever gains richer separator semantics, keep the whitelist explicit. Do not expand the allowed HTML surface casually.

Severity

6.1 (Medium)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 7.1.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "mediawiki/semantic-media-wiki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-77607"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-18T16:50:01Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "#### Failure mode\n\n`sep` was inserted verbatim into the HTML that joins a table cell\u0027s values. This made it possible to inject HTML through the separator value. The same unsanitised table HTML is produced both for the standard `Special:Ask` render and for its raw request output (`request_type=raw`), so the injection was reachable without authentication.\n\n#### Remediation\n\n- In all non-wiki output modes (HTML, raw request, file), `sep` is escaped unless it is a safe `\u003cbr\u003e` variant.\n- This preserves legitimate line-break separators while blocking markup injection.\n\n#### Maintenance note\n\nIf the table renderer ever gains richer separator semantics, keep the whitelist explicit. Do not expand the allowed HTML surface casually.",
  "id": "GHSA-7xv3-gf2g-498h",
  "modified": "2026-09-18T16:50:01Z",
  "published": "2026-09-18T16:50:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-7xv3-gf2g-498h"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SemanticMediaWiki/SemanticMediaWiki"
    },
    {
      "type": "WEB",
      "url": "https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0"
    }
  ],
  "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"
    }
  ],
  "summary": "Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS"
}

CVE-2026-77607 (GCVE-0-2026-77607)

Vulnerability from cvelistv5 – Published: 2026-09-18 16:51 – Updated: 2026-09-18 19:55

Title

Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS

Summary

Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, `sep` was inserted verbatim into HTML cell joins. This made it possible to inject HTML through the separator value. Version 7.2.0 fixes the issue.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 19:54 UTC

CWE

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

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/SemanticMediaWiki/SemanticMedi…	x_refsource_CONFIRM
https://github.com/SemanticMediaWiki/SemanticMedi…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
SemanticMediaWiki	SemanticMediaWiki	Affected: < 7.2.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-77607",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-18T19:54:52.891575Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-18T19:55:00.589Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "SemanticMediaWiki",
          "vendor": "SemanticMediaWiki",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.2.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki\u0027s pages. Prior to version 7.2.0, `sep` was inserted verbatim into HTML cell joins. This made it possible to inject HTML through the separator value. Version 7.2.0 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T16:51:10.125Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-7xv3-gf2g-498h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-7xv3-gf2g-498h"
        },
        {
          "name": "https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0"
        }
      ],
      "source": {
        "advisory": "GHSA-7xv3-gf2g-498h",
        "discovery": "UNKNOWN"
      },
      "title": "Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-77607",
    "datePublished": "2026-09-18T16:51:10.125Z",
    "dateReserved": "2026-08-20T20:48:20.507Z",
    "dateUpdated": "2026-09-18T19:55:00.589Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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.