CVE-2021-21259
CVSS V2 Medium 4.3
CVSS V3 Medium 6.1
Description
HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. As a workaround, disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content.
Overview
- CVE ID
- CVE-2021-21259
- Assigner
- security-advisories@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-01-22T17:15:12
- Last Modified Date
- 2021-06-08T14:36:18
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:* | 1 | OR | 1.7.2 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:N/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 4.3
- Severity
- MEDIUM
- Exploitability Score
- 8.6
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality Impact
- LOW
- Availability Impact
- NONE
- Base Score
- 6.1
- Base Severity
- MEDIUM
- Exploitability Score
- 2.8
- Impact Score
- 2.7
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2 | Release Notes Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efef | Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxw | Third Party Advisory |
| https://github.com/hackmdio/codimd/issues/1648 | Exploit Patch Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-21259 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21259 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 07:12:19 | Added to TrackCVE | |||
| 2022-12-05 20:45:53 | 2021-01-22T17:15Z | 2021-01-22T17:15:12 | CVE Published Date | updated |
| 2022-12-05 20:45:53 | 2021-06-08T14:36:18 | CVE Modified Date | updated | |
| 2022-12-05 20:45:53 | Analyzed | Vulnerability Status | updated |