CVE-2021-29503
HedgeDoc Cross-Site Scripting (XSS) in Note Editor
Description
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.
INFO
Published Date :
May 19, 2021, 8:15 p.m.
Last Modified :
April 25, 2022, 8:09 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-29503.
| URL | Resource |
|---|---|
| https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7 | Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2 | Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq | Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-29503 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-29503 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Apr. 25, 2022
Action Type Old Value New Value Added CWE NIST CWE-79 -
Initial Analysis by [email protected]
May. 26, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Changed Reference Type https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7 No Types Assigned https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7 Patch, Third Party Advisory Changed Reference Type https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2 No Types Assigned https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2 Third Party Advisory Changed Reference Type https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq No Types Assigned https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.2
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-29503 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-29503
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.10 }} 0.01%
score
0.40208
percentile