GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration
hsec-2023-0008
Vulnerability from osv_haskell
Published
2025-11-14 14:45
Modified
2025-11-14 14:45
Summary
Stored XSS in hledger-web
Details

Stored XSS in hledger-web

An issue was discovered in hledger-web < 1.23. A Stored Cross-Site Scripting (XSS) vulnerability exists in toBloodhoundJson that allows an attacker to execute JavaScript by encoding user-controlled values in a payload with base64 and parsing them with the atob function.

hledger-web forms sanitise obvious JavaScript, but not obfuscated JavaScript (see OWASP Filter Evasion Cheat Sheet). This means hledger-web instances, especially anonymously-writable ones like demo.hledger.org, could be loaded with malicious JavaScript to be executed by subsequent visitors.

Reported by Gaspard Baye and Hamidullah Muslih. Fix by Arsen Arsenović.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2023/HSEC-2023-0008.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2023/HSEC-2023-0008.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "hledger-web"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.24"
            },
            {
              "fixed": "1.23"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-46888"
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# Stored XSS in *hledger-web*\n\nAn issue was discovered in *hledger-web* \u003c 1.23. A Stored Cross-Site\nScripting (XSS) vulnerability exists in `toBloodhoundJson` that\nallows an attacker to execute JavaScript by encoding user-controlled\nvalues in a payload with base64 and parsing them with the `atob`\nfunction.\n\n*hledger-web* forms sanitise obvious JavaScript, but not obfuscated\nJavaScript (see [OWASP Filter Evasion Cheat Sheet][cheatsheet]).\nThis means *hledger-web* instances, especially anonymously-writable\nones like `demo.hledger.org`, could be loaded with malicious\nJavaScript to be executed by subsequent visitors.\n\n[cheatsheet]: https://owasp.org/www-community/xss-filter-evasion-cheatsheet\n\nReported by Gaspard Baye and Hamidullah Muslih.  Fix by Arsen\nArsenovi\u0107.\n",
  "id": "HSEC-2023-0008",
  "modified": "2025-11-14T14:45:34Z",
  "published": "2025-11-14T14:45:34Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://github.com/simonmichael/hledger/issues/1525"
    },
    {
      "type": "INTRODUCED",
      "url": "https://github.com/simonmichael/hledger/commit/ec51d28839b2910eea360b1b8c72904b51cf7821"
    },
    {
      "type": "EVIDENCE",
      "url": "https://www.youtube.com/watch?v=QnRO-VkfIic"
    },
    {
      "type": "FIX",
      "url": "https://github.com/simonmichael/hledger/pull/1663"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "Stored XSS in hledger-web"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.