CVE-2024-40453Public exploitNetwork attack vector

Arbitrary code execution via unvalidated varName

Published Aug 21, 2024 · Updated Aug 23, 2024

Code injection in Squirrelly 9.0.0 allows attackers to execute JavaScript through a crafted options.varName value. The compile function inserts options.varName into generated template source without verifying that it is a valid JavaScript identifier, so metacharacters can alter the compiled function body. Exploitation requires an application to pass attacker-controlled configuration into template compilation; successful injection runs with the privileges of the hosting Node.js process.

CVSS severity9.8
Critical
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Squirrelly 9.0.0 allows attackers to execute JavaScript through a crafted options.varName value. The compile function inserts options.varName into generated template source without verifying that it is a valid JavaScript identifier, so metacharacters can alter the compiled function body. Exploitation requires an application to pass attacker-controlled configuration into template compilation; successful injection runs with the privileges of the hosting Node.js process.

The record

CVE
CVE-2024-40453
Published
Aug 21, 2024
Updated
Aug 23, 2024
Vendor
Squirrelly
Product
Squirrelly
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 23, 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=9.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Squirrelly · Squirrellyversion=9.0.0

Published CVSS scores

9.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

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-94Improper Control of Generation of Code ('Code Injection')
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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