Semantic MediaWiki affected by reflected XSS in `Special:Ask` via a forged cursor pagination token

{
  "id": "83104449f603fe46132d992d4da6862fa9700fb60ae7e817caf1db2e87f8d0c0",
  "url": "https://osv.dev/vulnerability/CVE-2026-77616",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Semantic MediaWiki affected by reflected XSS in `Special:Ask` via a forged cursor pagination token",
    "summary": "Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. In versions 7.0.0 through 7.1.0, `Special:Ask` accepts a `cursor` query parameter for keyset pagination (added in 7.0.0). The token is decoded by `CursorEncoder`, which is an **unsigned** base64url-encoded JSON blob, so its contents are fully attacker-controlled. When the cursor's sort anchor does not match the request's `sort=` / `order=`, `QueryCreator::applyCursorIfRequested()` builds an error message by interpolating the attacker-controlled `sort_prop` / `sort_order` values into a raw string via `Query::addErrors()`. Unlike SMW's message-key errors, this raw string bypasses the message layer's sanitization (`ProcessingErrorMsgHandler::normalizeAndDecodeMessages()` passes a non-key, non-encoded string through unchanged). `ErrorWidget::queryError()` then assembles the errors and passes them to `Html::errorBox()`, whose first argument is emitted as raw HTML. The result is a reflected cross-site scripting vulnerability: a crafted `cursor` token containing markup in `sort_prop` (or `sort_order`) executes script in the victim's browser on the wiki origin. No authentication or special permission is required. The payload is delivered via a crafted link. Version 7.2.0 contains a fix.",
    "evidence": "osv:CVE-2026-77616",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-77616",
      "aliases": [
        "CVE-2026-77616",
        "GHSA-cx86-7xwp-w9wf"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/semanticmediawiki/semanticmediawiki",
              "type": "GIT",
              "events": [
                {
                  "introduced": "317dc05c8f14c5bf0e4eaae576b33540e2068593"
                },
                {
                  "fixed": "0d11c070bbe64f4425e3ab8be89eefa926dd9e4e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "7.0.0"
                      },
                      {
                        "fixed": "7.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0d11c070bbe64f4425e3ab8be89eefa926dd9e4e"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "7.2.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "7.1.0",
            "7.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77616.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.411774759Z",
      "provider": "osv",
      "references": [
        "https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77616.json",
        "https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-cx86-7xwp-w9wf",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-77616"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77616.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-77616",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490110,
  "published_at": "2026-09-18T16:58:47.062+00:00"
}