CVE-2021-29503

Katalog CVE

CVSS 6.1 · Medium EPSS 1,0%

Kerentanan Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) pada hedgedoc. Skor CVSS 3.1 6.1 (Medium) menurut NVD.

Deskripsi (NVD)

HedgeDoc is a platform to write and share markdown. HedgeDoc before version 1.8.2 is vulnerable to a cross-site scripting attack using the YAML-metadata of a note. An attacker with write access to a note can embed HTML tags in the Open Graph metadata section of the note, resulting in the frontend rendering the script tag as part of the `<head>` section. Unless your instance prevents guests from editing notes, this vulnerability allows unauthenticated attackers to inject JavaScript into notes that allow guest edits. If your instance prevents guests from editing notes, this vulnerability allows authenticated attackers to inject JavaScript into any note pages they have write-access to. This vulnerability is patched in version 1.8.2. As a workaround, one can disable guest edits until the next update.

Rincian

Terbit di NVD

19 Mei 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

6.1 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

EPSS (30 hari)

1,0% peluang dieksploitasi; lebih tinggi dari 62,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7 patch · advisory pihak ketiga
• https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq patch · advisory pihak ketiga
• https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2 advisory pihak ketiga