CVE-2023-39532Public exploitNetwork attack vector

Host code execution via spread dynamic import

Published Aug 8, 2023 · Updated Oct 10, 2024

Improper input validation in EndoJS Endo SES allows attackers to escape guest confinement and execute code in the host context. The rejectImportExpressions transform's regular expression treats the three dots before import as property access, so a spread expression reaches the host's dynamic import. A guest Compartment needs no endowments; consequences depend on host module support, with Node.js data URLs enabling code execution and a restrictive web CSP limiting imports.

CVSS severity9.8
Critical
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in EndoJS Endo SES allows attackers to escape guest confinement and execute code in the host context. The rejectImportExpressions transform's regular expression treats the three dots before import as property access, so a spread expression reaches the host's dynamic import. A guest Compartment needs no endowments; consequences depend on host module support, with Node.js data URLs enabling code execution and a restrictive web CSP limiting imports.

The record

CVE
CVE-2023-39532
Published
Aug 8, 2023
Updated
Oct 10, 2024
Vendor
EndoJS
Product
Endo
Classifications
CWE-20, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 0.13.0, < 0.13.5
  2. Affected versionversion=>= 0.14.0, < 0.14.5
  3. Affected versionversion=>= 0.15.0, < 0.15.24
  4. Affected versionversion== 0.16.0
  5. Affected versionversion== 0.17.0
  6. Affected versionversion=>= 0.18.0, < 0.18.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EndoJS · Endoversion=>= 0.13.0, < 0.13.5; version=>= 0.14.0, < 0.14.5; version=>= 0.15.0, < 0.15.24; version== 0.16.0; version== 0.17.0; version=>= 0.18.0, < 0.18.7

Published CVSS scores

9.8GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1059.007JavaScript/JScript

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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