CVE-2021-41086Public exploitNetwork attack vector

Cross-site scripting via unsanitized clipboard HTML

Published Sep 21, 2021 · Updated Aug 4, 2024

DOM-based XSS in the jSuites HTML editor before 4.9.11 allows remote attackers to execute script through pasted clipboard content. The editor's paste parser writes clipboard-derived HTML into innerHTML without removing executable image event-handler attributes. A victim must copy attacker-controlled HTML and paste it into the editor, after which the script runs in the page's browser context.

CVSS severity8.7
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM-based XSS in the jSuites HTML editor before 4.9.11 allows remote attackers to execute script through pasted clipboard content. The editor's paste parser writes clipboard-derived HTML into innerHTML without removing executable image event-handler attributes. A victim must copy attacker-controlled HTML and paste it into the editor, after which the script runs in the page's browser context.

The record

CVE
CVE-2021-41086
Published
Sep 21, 2021
Updated
Aug 4, 2024
Vendor
jSuites
Product
jSuites
Classifications
CWE-79, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 21, 2021CVE 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=< 4.9.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

jSuites · jSuitesversion=< 4.9.11

Published CVSS scores

8.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
5.4GitLabCVSS:3.1/AV:N/AC:L/PR:L/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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