Security advisory

{
  "id": "add7ce9762e4d1feb47254ad45fc8f080d5d7781972a7ce683327137b5385765",
  "url": "https://osv.dev/vulnerability/CVE-2026-21640",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-21640",
    "summary": "HackerOne community member Faraz Ahmed (PakCyberbot) has reported a format string injection in the Revive Adserver settings. When specific character combinations are used in a setting, the admin user console could be disabled due to a fatal PHP error.",
    "evidence": "osv:CVE-2026-21640",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-21640",
      "aliases": [
        "CVE-2026-21640"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/revive-adserver/revive-adserver",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d30dee449a2da3d687c66fc4c162ed0b3e39482c"
                },
                {
                  "last_affected": "37592f9d564b248f86b8230f5bdd53bbaa852f9e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:aquaplatform:revive_adserver:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "last_affected": "6.0.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.0.4",
            "v6.0.3",
            "v6.0.2",
            "v6.0.1",
            "v6.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21640.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.292614775Z",
      "provider": "osv",
      "references": [
        "https://hackerone.com/reports/3445332",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21640.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-21640"
      ],
      "provider_metadata": {
        "cna_assigner": "hackerone",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "6"
                  },
                  {
                    "last_affected": "6.0.4"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21640.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-21640",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518972,
  "published_at": "2026-01-20T20:48:47.94+00:00"
}