Security advisory

{
  "id": "bc34ef54589b853c56f3fe15b2eb411f0eda29f4df0e6190376ca52b392f3c09",
  "url": "https://osv.dev/vulnerability/CVE-2021-3271",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3271",
    "summary": "PressBooks 5.17.3 contains a cross-site scripting (XSS). Stored XSS can be submitted via the Book Info's Long Description Body, and all actions to open or preview the books page will result in the triggering the stored XSS.",
    "evidence": "osv:CVE-2021-3271",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-3271",
      "aliases": [
        "CVE-2021-3271",
        "GHSA-9652-78hp-w58c"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pressbooks/pressbooks",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "d3275b9c903363cf66d1a344d75b2d7069c7f146"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:pressbooks:pressbooks:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "5.17.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.17.3",
            "5.17.2",
            "5.17.1",
            "5.17.0",
            "5.16.3",
            "5.16.2",
            "5.16.1",
            "5.16.0",
            "5.15.3",
            "5.15.2",
            "5.15.1",
            "5.15.0",
            "5.14.6",
            "5.14.5",
            "5.14.4",
            "5.14.3",
            "5.14.2",
            "5.14.1",
            "5.14.0",
            "5.13.0",
            "5.12.0",
            "5.11.0",
            "5.10.1",
            "5.10.0",
            "5.9.5",
            "5.9.4",
            "5.9.3",
            "5.9.2",
            "5.9.1",
            "5.9.0",
            "5.8.3",
            "5.8.2",
            "5.8.1",
            "5.8.0",
            "5.7.2",
            "5.7.1",
            "5.6.5",
            "5.6.4",
            "5.6.3",
            "5.6.2",
            "5.6.1",
            "5.6.0",
            "5.5.0",
            "5.4.2",
            "5.4.1",
            "5.4.0",
            "5.3.2",
            "5.3.1",
            "5.3.0",
            "5.2.1",
            "5.2.0",
            "5.1.1",
            "5.1.0",
            "5.0.1",
            "5.0.0",
            "4.5.1",
            "4.5.0",
            "4.4.0",
            "4.3.5",
            "4.3.4",
            "4.3.3",
            "4.3.2",
            "4.3.1",
            "4.3.0",
            "4.2.0",
            "4.1.0",
            "4.0.0",
            "3.9.10",
            "3.9.9",
            "3.9.8.2",
            "3.9.8.1",
            "3.9.7.1",
            "v3.9.7",
            "v3.9.6",
            "v3.9.5.1",
            "v3.9.5",
            "v3.9.4.2",
            "v3.9.4.1",
            "v3.9.4",
            "v3.9.3",
            "v3.9.2.1",
            "v3.9.2",
            "v3.9.1",
            "v3.9.0",
            "v3.8.1",
            "v3.8.0",
            "v3.7.1",
            "v3.7.0",
            "v3.6.0",
            "v3.5.2",
            "v3.5.1",
            "v3.5.0",
            "v3.4.0",
            "v3.3.2",
            "v3.3.1",
            "v3.3.0",
            "v3.2.0",
            "v3.1.2",
            "v3.1.1",
            "v3.1",
            "v2.7.1",
            "v2.7",
            "v2.6.7",
            "v2.6.6",
            "v2.6.5",
            "v2.6",
            "v2.5.4",
            "v2.5.3",
            "v2.5.2",
            "v2.5.1",
            "v2.5",
            "v2.4.5",
            "v2.4.4",
            "v2.4.3",
            "v2.3.3",
            "v2.3.2",
            "v2.3",
            "v2.2.1",
            "v2.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3271.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:46.429482515Z",
      "provider": "osv",
      "references": [
        "https://github.com/pressbooks/pressbooks",
        "https://github.com/pressbooks/pressbooks/pull/2072",
        "https://www.gosecure.net/blog/2021/02/16/cve-2021-3271-pressbooks-stored-cross-site-scripting-proof-of-concept/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3271",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386125,
  "published_at": "2021-02-18T19:15:13.273+00:00"
}