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CVE-2026-53592

MEDIUM Exploitation: PoC
4.6
CVSS 3.1
Description
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. A Prototype Pollution condition in the `getQueryParam` function `/public/js/main.js` and was addressed in version 1.8.139 by blocking URL query keys matching the pattern `__proto__`. However, this mitigation is incomplete: it only filters top-level `__proto__` keys and fails to sanitize nested forms such as `b[__proto__][polluted]=PWNED`. As a result, an attacker-controlled URL query string can still write into `Object.prototype` on any page that loads `main.js`. Version 1.8.223 contains a updated fix.

Metadata

CVE ID
CVE-2026-53592
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-09 19:39 UTC
Published
2026-07-20 19:49 UTC
Last updated
2026-07-21 14:42 UTC
Primary CWE
CWE-1321
CWE-1321: Improperly Controlled Modification of Object Proto…
Vendor / Product
freescout-help-desk / freescout
Sources
cve.org  ·  NVD

Severity & Metrics

4.6 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
freescout-help-desk freescout — < 1.8.223
Weakness (CWE)
CWESourceDescription
CWE-1321 cna CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.6 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
References (1)
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