Unvalidated gitlab URL parameter redirects OAuth authorize step to attacker-controlled host

{
  "id": "fe4cfa388fdaedfb3c4953f84d4e7b524f6fee1a1d2e16b0ca0db29d05fdc9be",
  "url": "https://osv.dev/vulnerability/CVE-2026-42195",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Unvalidated gitlab URL parameter redirects OAuth authorize step to attacker-controlled host",
    "summary": "draw.io is a configurable diagramming and whiteboarding application. Prior to version 29.7.9, the draw.io client accepts a ?gitlab= URL parameter that overrides the GitLab server URL used during OAuth sign-in. A crafted link causes the user's click on draw.io's \"Authorize in GitLab\" dialog to open a popup on the attacker-controlled host instead of gitlab.com. This can lead to credential fishing and session state token exfiltration. This issue has been patched in version 29.7.9.",
    "evidence": "osv:CVE-2026-42195",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-42195",
      "aliases": [
        "CVE-2026-42195",
        "GHSA-8x7j-m8px-7p8x"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jgraph/drawio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5dc0133c688dc28e1990f0b0fb4808732e814f09"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "29.7.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5dc0133c688dc28e1990f0b0fb4808732e814f09"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v29.7.9"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "29.7.9"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v29.6.10",
            "v29.6.7",
            "v29.6.6",
            "v29.6.5",
            "v29.6.4",
            "v29.6.3",
            "v29.6.1",
            "v29.5.2",
            "v29.5.1",
            "v29.3.6",
            "v29.3.5",
            "v29.3.2",
            "v29.3.0",
            "v29.2.9",
            "v29.2.7",
            "v29.2.6",
            "v29.2.2",
            "v29.0.3",
            "v29.0.2",
            "v28.2.9",
            "v28.2.8",
            "v28.2.7",
            "v28.2.5",
            "v28.2.3",
            "v28.2.0",
            "v28.1.2",
            "v28.1.1",
            "v28.0.9",
            "v28.0.7",
            "v28.0.6",
            "v28.0.5",
            "v28.0.4",
            "v28.0.3",
            "v28.0.1",
            "v27.1.6",
            "v27.0.9",
            "v27.0.5",
            "v27.0.2",
            "v26.2.15",
            "v26.2.8",
            "v26.2.7",
            "v26.2.2",
            "v26.1.1",
            "v26.1.0",
            "v26.0.16",
            "v26.0.15",
            "v26.0.13",
            "v26.0.9",
            "v26.0.7",
            "v26.0.6",
            "v26.0.4",
            "v26.0.3",
            "v26.0.2",
            "v26.0.0",
            "v25.0.2",
            "v25.0.1",
            "v25.0.0",
            "v24.8.9"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42195.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.485045667Z",
      "provider": "osv",
      "references": [
        "https://github.com/jgraph/drawio/releases/tag/v29.7.9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42195.json",
        "https://github.com/jgraph/drawio/security/advisories/GHSA-8x7j-m8px-7p8x",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42195",
        "https://github.com/jgraph/drawio/issues/493"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200",
          "CWE-601"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42195.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42195",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522192,
  "published_at": "2026-05-08T21:22:40.678+00:00"
}