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Medium

Security advisory

Type: advisorySources: OSVCVE: CVE-2020-11055

In BookStack greater than or equal to 0.18.0 and less than 0.29.2, there is an XSS vulnerability in comment creation. A user with permission to create comments could POST HTML directly to the system to be saved in a comment, which would then be executed/displayed to others users viewing the comment. Through this vulnerability custom JavaScript code could be injected and therefore ran on other user machines. This most impacts scenarios where not-trusted users are given permission to create comments. This has been fixed in 0.29.2.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-11055
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 10:48 UTC · Revision 1

Source evidence

CVE-2020-11055

core-osv · Original source

Published 7 May 2020, 21:15 UTC

In BookStack greater than or equal to 0.18.0 and less than 0.29.2, there is an XSS vulnerability in comment creation. A user with permission to create comments could POST HTML directly to the system to be saved in a comment, which would then be executed/displayed to others users viewing the comment. Through this vulnerability custom JavaScript code could be injected and therefore ran on other user machines. This most impacts scenarios where not-trusted users are given permission to create comments. This has been fixed in 0.29.2.

osv:CVE-2020-11055
Complete source record
{
  "id": "00927dc9d3f21f1b59dc4e1bbc32a2a6ef4ed3fc7be2a85e4270e17bc0c342ae",
  "url": "https://osv.dev/vulnerability/CVE-2020-11055",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-11055",
    "summary": "In BookStack greater than or equal to 0.18.0 and less than 0.29.2, there is an XSS vulnerability in comment creation. A user with permission to create comments could POST HTML directly to the system to be saved in a comment, which would then be executed/displayed to others users viewing the comment. Through this vulnerability custom JavaScript code could be injected and therefore ran on other user machines. This most impacts scenarios where not-trusted users are given permission to create comments. This has been fixed in 0.29.2.",
    "evidence": "osv:CVE-2020-11055",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-11055",
      "aliases": [
        "CVE-2020-11055",
        "GHSA-5vf7-q87h-pg6w"
      ],
      "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/bookstackapp/bookstack",
              "type": "GIT",
              "events": [
                {
                  "introduced": "75915e8a9415af90c8c6402fd822d5c29960d3d3"
                },
                {
                  "fixed": "04ecc128a237c22b5ff724f2328f0b6922ff3428"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.18.0"
                      },
                      {
                        "fixed": "0.29.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "04ecc128a237c22b5ff724f2328f0b6922ff3428"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.29.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.29.1",
            "v0.29.0",
            "v0.28.3",
            "v0.28.2",
            "v0.28.1",
            "v0.28.0",
            "v0.27.5",
            "v0.27.4",
            "v0.27.3",
            "v0.27.2",
            "v0.27.1",
            "v0.27",
            "v0.26.4",
            "v0.26.3",
            "v0.26.2",
            "v0.26.1",
            "v0.26.0",
            "v0.25.5",
            "v0.25.4",
            "v0.25.3",
            "v0.25.2",
            "v0.25.1",
            "v0.25.0",
            "v0.24.3",
            "v0.24.2",
            "v0.24.1",
            "v0.24.0",
            "v0.23.2",
            "v0.23.1",
            "v0.23.0",
            "v0.22.0",
            "v0.21.0",
            "v0.20.3",
            "v0.20.2",
            "v0.20.1",
            "v0.20.0",
            "v0.19.0",
            "v0.18.5",
            "v0.18.4",
            "v0.18.3",
            "v0.18.2",
            "v0.18.1",
            "v0.18.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-11055.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:45.276381693Z",
      "provider": "osv",
      "references": [
        "https://bookstackapp.com/blog/beta-release-v0-29-2/",
        "https://github.com/BookStackApp/BookStack/releases/tag/v0.29.2",
        "https://github.com/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-11055",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382871,
  "published_at": "2020-05-07T21:15:11.733+00:00"
}