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CVE-2021-21259— Stored XSS in slide mode

Quick assessment

Affected
hedgedoc hedgedoc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hedgedoc是Hedgedoc团队的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.7.2 存在跨站脚本漏洞，攻击者可利用该漏洞注入任意JavaScript。

CVSS 7.4 · High EPSS 1.35% · P69

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-21259

Vulnerability Information
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Vulnerability Title
Stored XSS in slide mode
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Hedgedoc 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hedgedoc是Hedgedoc团队的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.7.2 存在跨站脚本漏洞，攻击者可利用该漏洞注入任意JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hedgedoc hedgedoc < 1.7.2 -

II. Public POCs for CVE-2021-21259

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III. Intelligence Information for CVE-2021-21259

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Patches & Fixes for CVE-2021-21259 (1)

Vendor Advisories for CVE-2021-21259 (1)

Other References for CVE-2021-21259 (2)

IV. Related Vulnerabilities

Same product: hedgedoc
Same vendor: hedgedoc
Same weakness: CWE-79

V. Comments for CVE-2021-21259

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