Security advisory

{
  "id": "2871b4953f1919b503e1039243577c7429e54471e02f8e3fd2c6be34bc34b5d0",
  "url": "https://osv.dev/vulnerability/CVE-2021-21260",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21260",
    "summary": "Online Invoicing System (OIS) is open source software which is a lean invoicing system for small businesses, consultants and freelancers created using AppGini. In OIS version 4.0 there is a stored XSS which can enables an attacker takeover of the admin account through a payload that extracts a csrf token and sends a request to change password. It has been found that Item description is reflected without sanitization in app/items_view.php which enables the malicious scenario.",
    "evidence": "osv:CVE-2021-21260",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-21260",
      "aliases": [
        "CVE-2021-21260",
        "GHSA-rm79-5596-r7q4"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bigprof-software/online-invoicing-system",
              "type": "GIT",
              "events": [
                {
                  "introduced": "18522835aa2b23c5376bc1c68ef727f41f334f79"
                },
                {
                  "last_affected": "18522835aa2b23c5376bc1c68ef727f41f334f79"
                },
                {
                  "fixed": "4e4d8d0a4017f0b3d56b281b47223785dcb7ffec"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bigprof:online_invoicing_system:4.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0"
                      },
                      {
                        "last_affected": "4.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4e4d8d0a4017f0b3d56b281b47223785dcb7ffec"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "4.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21260.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:27.817422758Z",
      "provider": "osv",
      "references": [
        "https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.2",
        "https://github.com/bigprof-software/online-invoicing-system/security/advisories/GHSA-rm79-5596-r7q4"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-21260",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385383,
  "published_at": "2021-01-22T18:15:12.61+00:00"
}