CVE-2023-37360Public exploit

JavaScript execution via unescaped URL backslashes

Published Jun 30, 2023 · Updated Nov 26, 2024

Code injection in Pacparser before 1.4.2 allows attackers to execute JavaScript in the embedded engine via a crafted URL. The pacparser_find_proxy function URL-encodes single quotes but leaves backslashes unescaped before concatenating URL and host data into a JavaScript call. A trailing backslash escapes the closing quote; persistent privileged integrations can return attacker-selected proxy values, while native privilege escalation requires a separate SpiderMonkey sandbox escape.

CVSS severity5.9
Medium
EPSS probability0.36%
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 Pacparser before 1.4.2 allows attackers to execute JavaScript in the embedded engine via a crafted URL. The pacparser_find_proxy function URL-encodes single quotes but leaves backslashes unescaped before concatenating URL and host data into a JavaScript call. A trailing backslash escapes the closing quote; persistent privileged integrations can return attacker-selected proxy values, while native privilege escalation requires a separate SpiderMonkey sandbox escape.

The record

CVE
CVE-2023-37360
Published
Jun 30, 2023
Updated
Nov 26, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-74, CWE-94, T1059.007
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 26, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.9GitHub Security AdvisoryCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript/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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