CVE-2020-11051Network attack vector

Stored script execution via unsanitized Markdown preview

Published May 5, 2020 · Updated Aug 4, 2024

Stored XSS in the Markdown preview in Requarks Wiki.js before 2.3.81 allows remote authenticated users to execute script in another editor's browser. The editor-markdown.vue input handler assigns md.render output directly to previewHTML without sanitizing it, so crafted page Markdown becomes executable preview DOM. Both users need page-write access, and the payload runs only when the victim opens the malicious page in the Markdown editor, not in the rendered page.

CVSS severity6.9
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the Markdown preview in Requarks Wiki.js before 2.3.81 allows remote authenticated users to execute script in another editor's browser. The editor-markdown.vue input handler assigns md.render output directly to previewHTML without sanitizing it, so crafted page Markdown becomes executable preview DOM. Both users need page-write access, and the payload runs only when the victim opens the malicious page in the Markdown editor, not in the rendered page.

The record

CVE
CVE-2020-11051
Published
May 5, 2020
Updated
Aug 4, 2024
Vendor
Requarks.io
Product
Wiki.js
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.3.81

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Requarks.io · Wiki.jsversion=< 2.3.81

Published CVSS scores

6.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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