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CVE Record

CVE-2021-41086: Clipboard-based XSS in jsuites

jsuites is an open source collection of common required javascript web components. In affected versions users are subject to cross site scripting (XSS) attacks via clipboard content. jsuites is vulnerable to DOM based XSS if the user can be tricked into copying _anything_ from a malicious and pasting it into the html editor. This is because a part of the clipboard content is directly written to `innerHTML` allowing for javascript injection and thus XSS. Users are advised to update to version 4.9.11 to resolve.

HighCVSS 8.7Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-41086 is a high-severity clipboard-based XSS issue in jsuites before 4.9.11. A user who pastes content into the HTML editor after being tricked by a malicious source could expose the web application session to script execution.

Executive priority

Treat this as a targeted remediation item for affected web applications. It is high severity, but current provided evidence does not show known active exploitation.

Technical view

The advisory describes DOM-based XSS in jsuites where clipboard content pasted into the HTML editor is written to innerHTML, enabling JavaScript injection. Affected versions are jsuites before 4.9.11. CVSS 3.1 is 8.7 with required user interaction and changed scope.

Likely exposure

Exposure is likely in web applications that bundle jsuites versions earlier than 4.9.11 and expose the HTML editor to users who paste content.

Exploitation context

The source bundle does not show CISA KEV listing or cited active exploitation. Exploitation requires user interaction: copying from a malicious source and pasting into the affected editor.

Researcher notes

The key exposure condition is the paste path into the HTML editor, not general jsuites usage alone. The supplied evidence names the fixed version and two related commits, but does not provide broader exploit telemetry.

Mitigation direction

  • Upgrade jsuites to version 4.9.11 or later.
  • Inventory package manifests and lockfiles for vulnerable jsuites versions.
  • Prioritize applications where the jsuites HTML editor handles untrusted user content.
  • Check the GitHub advisory for any additional vendor guidance.

Validation and detection

  • Confirm deployed jsuites versions are 4.9.11 or later.
  • Identify routes or components using the jsuites HTML editor.
  • Run regression testing around paste handling after the upgrade.
  • Verify production bundles no longer include vulnerable jsuites builds.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2021-41086 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.7 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.7CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N2.35.8Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

8.7High
CVSS 3.1 vector shape for CVE-2021-41086Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
jsuitesjsuites< 4.9.11Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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