LinkAce has a Cross-User Tag/List Attachment IDOR in processTaxonomy()

{
  "id": "429a00c954565fa40b973f38301e7401849025efb3768b17d49c319ed8ea623b",
  "url": "https://osv.dev/vulnerability/CVE-2026-30954",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LinkAce has a Cross-User Tag/List Attachment IDOR in processTaxonomy()",
    "summary": "LinkAce is a self-hosted archive to collect website links. In 2.1.0 and earlier, the processTaxonomy() method in LinkRepository.php allows authenticated users to attach other users' private tags and lists to their own links by passing integer IDs.",
    "evidence": "osv:CVE-2026-30954",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-30954",
      "aliases": [
        "CVE-2026-30954",
        "GHSA-vc99-cgj6-wwxh"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kovah/linkace",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "b3e0f65e9b9a523be495b1e006f676cd401a1b84"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:linkace:linkace:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.1.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.0",
            "v2.0.0",
            "v2.0.0-beta4",
            "v2.0.0-beta3",
            "v2.0.0-beta2",
            "v2.0.0-beta1",
            "v1.10.1",
            "v1.10.0",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.1",
            "v1.8.0",
            "v1.7.0",
            "v1.6.4",
            "v1.6.3",
            "v1.6.2",
            "v1.6.1",
            "v1.6.0",
            "v1.5.0",
            "v1.4.1",
            "v1.4.0",
            "v1.3.1",
            "v1.3.0",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v0.0.44",
            "v0.0.43",
            "v0.0.42",
            "v0.0.41",
            "v0.0.40",
            "v0.0.39",
            "v0.0.38",
            "v0.0.37",
            "v0.0.36",
            "v0.0.35",
            "v0.0.34",
            "v0.0.33",
            "v0.0.32",
            "v0.0.31",
            "v0.0.30",
            "v0.0.29",
            "v0.0.28",
            "v0.0.27",
            "v0.0.26",
            "v0.0.25",
            "v0.0.24",
            "v0.0.23",
            "v0.0.22",
            "v0.0.21",
            "v0.0.20",
            "v0.0.19",
            "v0.0.18",
            "v0.0.17",
            "v0.0.16",
            "v0.0.15",
            "v0.0.14",
            "v0.0.13",
            "v0.0.12",
            "v0.0.11",
            "v0.0.10",
            "v0.0.9",
            "v0.0.8",
            "v0.0.7",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30954.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.267655982Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30954.json",
        "https://github.com/Kovah/LinkAce/security/advisories/GHSA-vc99-cgj6-wwxh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-30954"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30954.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-30954",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493839,
  "published_at": "2026-03-10T20:40:31.011+00:00"
}