Medium
FreeScout vulnerable to prototype pollution in getQueryParam
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-53592
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 01:32 UTC · Revision 1
Source evidence
FreeScout vulnerable to prototype pollution in getQueryParam
core-osv · Original sourcePublished 20 Jul 2026, 19:49 UTC
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.
osv:CVE-2026-53592
Complete source record
{
"id": "5c7d4c0a0049dc4345d3235ef4eb6b80f8f1f945758487c1749c2c08f5d035de",
"url": "https://osv.dev/vulnerability/CVE-2026-53592",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "FreeScout vulnerable to prototype pollution in getQueryParam",
"summary": "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.",
"evidence": "osv:CVE-2026-53592",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-53592",
"aliases": [
"CVE-2026-53592",
"GHSA-w5fc-8pp3-f755"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/freescout-help-desk/freescout",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "7cb9f8c713651163065269cef3c3973a4e5bda5f"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.8.223"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
}
],
"versions": [
"1.8.222",
"1.8.221",
"1.8.220",
"1.8.219",
"1.8.218",
"1.8.217",
"1.8.216",
"1.8.215",
"1.8.214",
"1.8.213",
"1.8.212",
"1.8.211",
"1.8.210",
"1.8.209",
"1.8.208",
"1.8.207",
"1.8.206",
"1.8.205",
"1.8.204",
"1.8.203",
"1.8.202",
"1.8.201",
"1.8.200",
"1.8.199",
"1.8.198",
"1.8.197",
"1.8.196",
"1.8.195",
"1.8.194",
"1.8.193",
"1.8.192",
"1.8.191",
"1.8.190",
"1.8.189",
"1.8.188",
"1.8.187",
"1.8.186",
"1.8.185",
"1.8.184",
"1.8.183",
"1.8.182",
"1.8.181",
"1.8.180",
"1.8.179",
"1.8.178",
"1.8.177",
"1.8.176",
"1.8.175",
"1.8.174",
"1.8.173",
"1.8.172",
"1.8.171",
"1.8.170",
"1.8.169",
"1.8.168",
"1.8.167",
"1.8.166",
"1.8.165",
"1.8.164",
"1.8.163",
"1.8.162",
"1.8.161",
"1.8.160",
"1.8.159",
"1.8.158",
"1.8.157",
"1.8.156",
"1.8.155",
"1.8.154",
"1.8.153",
"1.8.152",
"1.8.151",
"1.8.150",
"1.8.149",
"1.8.148",
"1.8.147",
"1.8.146",
"1.8.145",
"1.8.144",
"1.8.143",
"1.8.142",
"1.8.141",
"1.8.140",
"1.8.139",
"1.8.138",
"1.8.137",
"1.8.136",
"1.8.135",
"1.8.134",
"1.8.133",
"1.8.132",
"1.8.131",
"1.8.130",
"1.8.129",
"1.8.128",
"1.8.127",
"1.8.126",
"1.8.125",
"1.8.124",
"1.8.123",
"1.8.122",
"1.8.121",
"1.8.120",
"1.8.119",
"1.8.118",
"1.8.117",
"1.8.116",
"1.8.115",
"1.8.114",
"1.8.113",
"1.8.112",
"1.8.111",
"1.8.110",
"1.8.109",
"1.8.108",
"1.8.107",
"1.8.106",
"1.8.105",
"1.8.104",
"1.8.103",
"1.8.102",
"1.8.101",
"1.8.100",
"1.8.99",
"1.8.98",
"1.8.97",
"1.8.96",
"1.8.95",
"1.8.94",
"1.8.93",
"1.8.92",
"1.8.91",
"1.8.90",
"1.8.89",
"1.8.88",
"1.8.87",
"1.8.86",
"1.8.85",
"1.8.84",
"1.8.83",
"1.8.82",
"1.8.81",
"1.8.80",
"1.8.79",
"1.8.78",
"1.8.77",
"1.8.76",
"1.8.75",
"1.8.74",
"1.8.73",
"1.8.72",
"1.8.71",
"1.8.70",
"1.8.69",
"1.8.68",
"1.8.67",
"1.8.66",
"1.8.65",
"1.8.63",
"1.8.62",
"1.8.61",
"1.8.60",
"1.8.59",
"1.8.58",
"1.8.57",
"1.8.56",
"1.8.55",
"1.8.54",
"1.8.53",
"1.8.52",
"1.8.51",
"1.8.50",
"1.8.49",
"1.8.48",
"1.8.47",
"1.8.46",
"1.8.45",
"1.8.44",
"1.8.43",
"1.8.42",
"1.8.41",
"1.8.40",
"1.8.39",
"1.8.38",
"1.8.37",
"1.8.36",
"1.8.35",
"1.8.34",
"1.8.33",
"1.8.32",
"1.8.31",
"1.8.30",
"1.8.29",
"1.8.28",
"1.8.27",
"1.8.26",
"1.8.25",
"1.8.24",
"1.8.23",
"1.8.22",
"1.8.21",
"1.8.20",
"1.8.19",
"1.8.18",
"1.8.17",
"1.8.16",
"1.8.15",
"1.8.14",
"1.8.13",
"1.8.12",
"1.8.11",
"1.8.10",
"1.8.9",
"1.8.8",
"1.8.7",
"1.8.6",
"1.8.5",
"1.8.4",
"1.8.3",
"1.8.2",
"1.8.1",
"1.8.0",
"1.7.30",
"1.7.28",
"1.7.27",
"1.7.26",
"1.7.25",
"1.7.24",
"1.7.23",
"1.7.22",
"1.7.21",
"1.7.20",
"1.7.19",
"1.7.18",
"1.7.17",
"1.7.16",
"1.7.15",
"1.7.14",
"1.7.13",
"1.7.12",
"1.7.11",
"1.7.10",
"1.7.9",
"1.7.7",
"1.7.6",
"1.7.5",
"1.7.4",
"1.7.3",
"1.7.2",
"1.7.1",
"1.7.0",
"1.6.20",
"1.6.19",
"1.6.18",
"1.6.17",
"1.6.16",
"1.6.15",
"1.6.14",
"1.6.13",
"1.6.12",
"1.6.11",
"1.6.10",
"1.6.9",
"1.6.8",
"1.6.7",
"1.6.6",
"1.6.5",
"1.6.4",
"1.6.3",
"1.6.2",
"1.6.1",
"1.6.0",
"1.5.15",
"1.5.14",
"1.5.13",
"1.5.12",
"1.5.11",
"1.5.10",
"1.5.9",
"1.5.8",
"1.5.7",
"1.5.6",
"1.5.5",
"1.5.4",
"1.5.3",
"1.5.2",
"1.5.1",
"1.5.0",
"1.4.12",
"1.4.11",
"1.4.10",
"1.4.9",
"1.4.8",
"1.4.7",
"1.4.6",
"1.4.4",
"1.4.3",
"1.4.2",
"1.4.1",
"1.4.0",
"1.3.19",
"1.3.18",
"1.3.17",
"1.3.16",
"1.3.15",
"1.3.14",
"1.3.13",
"1.3.12",
"1.3.11",
"1.3.10",
"1.3.9",
"1.3.8",
"1.3.7",
"1.3.6",
"1.3.5",
"1.3.4",
"1.3.3",
"1.3.2",
"1.3.1",
"1.3.0",
"1.2.6",
"1.2.5",
"1.2.4",
"1.2.3",
"1.2.2",
"1.2.1",
"1.2.0",
"1.1.10",
"1.1.9",
"1.1.8",
"1.1.7",
"1.1.6",
"1.1.5",
"1.1.4",
"1.1.3",
"1.1.2",
"1.1.1",
"1.1.0",
"1.0.9",
"1.0.8",
"1.0.7",
"1.0.6",
"1.0.5",
"1.0.4",
"1.0.3",
"1.0.2",
"1.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53592.json"
}
}
],
"modified": "2026-10-28T02:30:24.951605215Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53592.json",
"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-w5fc-8pp3-f755",
"https://nvd.nist.gov/vuln/detail/CVE-2026-53592"
],
"provider_metadata": {
"cwe_ids": [
"CWE-1321"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53592.json"
}
},
"related_cves": [
{
"value": "CVE-2026-53592",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491633,
"published_at": "2026-07-20T19:49:06.27+00:00"
}