Medium
Security advisory
Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the "allowedIframeHostnames" option.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-26539
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:39 UTC · Revision 1
Source evidence
Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the "allowedIframeHostnames" option.
osv:CVE-2021-26539
Complete source record
{
"id": "a84987e6f1a2bdb4598914482d86b932e46f2ded87c09c336159035c4fb5fb43",
"url": "https://osv.dev/vulnerability/CVE-2021-26539",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-26539",
"summary": "Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the \"allowedIframeHostnames\" option.",
"evidence": "osv:CVE-2021-26539",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-26539",
"aliases": [
"CVE-2021-26539",
"GHSA-rjqq-98f6-6j3r"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/apostrophecms/apostrophe",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "cb4cdb768294ff8aff8dd77307377d62e44eaf39"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:apostrophecms:sanitize-html:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.3.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"2.1.3",
"2.1.2",
"2.1.1",
"2.0.4",
"2.0.3",
"2.0.2",
"2.0.1",
"0.5.384",
"0.5.375",
"0.5.383",
"0.5.382",
"0.5.381",
"0.5.380",
"0.5.379",
"0.5.378",
"0.5.377",
"0.5.376",
"0.5.374",
"0.5.373",
"0.5.372",
"0.5.371",
"0.5.370",
"0.5.369",
"0.5.368",
"0.5.367",
"0.5.366",
"0.5.365",
"0.5.364",
"0.5.363",
"0.5.362",
"0.5.361",
"0.5.360",
"0.5.359",
"0.5.358",
"0.5.357",
"0.5.356",
"0.5.355",
"0.5.354",
"0.5.353",
"0.5.352",
"0.5.351",
"0.5.350",
"0.5.349",
"0.5.347",
"0.5.348",
"0.5.346",
"0.5.345",
"0.5.344",
"0.5.343",
"0.5.340",
"0.5.339",
"0.5.338",
"0.5.337",
"0.5.336",
"0.5.333",
"0.5.332",
"0.5.331",
"0.5.330",
"0.5.328",
"0.5.327",
"0.5.312",
"0.5.311",
"0.5.310",
"0.5.291",
"0.5.309",
"0.5.308",
"0.5.307",
"0.5.305",
"0.5.303",
"0.5.301",
"0.5.302",
"0.5.300",
"0.5.298",
"0.5.297",
"0.5.296",
"0.5.294",
"0.5.293",
"0.5.292",
"0.5.290",
"0.5.288",
"0.5.287",
"0.5.286",
"0.5.285",
"0.5.284",
"0.5.283",
"0.5.282",
"0.5.281",
"0.5.280",
"0.5.279",
"0.5.278",
"0.5.276",
"0.5.275",
"0.5.273",
"0.5.272",
"0.5.271",
"0.5.270",
"0.5.269",
"0.5.254",
"0.5.247",
"0.5.253",
"0.5.252",
"0.5.251",
"0.5.250",
"0.5.249",
"0.5.248",
"0.5.246",
"0.5.245",
"0.5.244",
"0.5.242",
"0.5.241",
"0.5.240",
"0.5.230",
"0.5.217",
"0.5.229",
"0.5.228",
"0.5.227",
"0.5.226",
"0.5.224",
"0.5.221",
"0.5.223",
"0.5.222",
"0.5.219",
"0.5.218",
"0.5.216",
"0.5.215",
"0.5.213",
"0.5.208",
"0.5.197",
"0.5.207",
"0.5.206",
"0.5.205",
"0.5.204",
"0.5.203",
"0.5.202",
"0.5.201",
"0.5.199",
"0.5.198",
"0.5.194",
"0.5.189",
"0.5.193",
"0.5.192",
"0.5.191",
"0.5.190",
"0.5.188",
"0.5.187",
"0.5.183",
"0.5.181",
"0.5.180",
"0.5.179",
"0.5.178",
"0.5.168",
"0.5.169",
"0.5.167",
"0.5.165",
"0.5.159",
"0.5.158",
"0.5.157",
"0.5.156",
"0.5.155",
"0.5.151",
"0.5.150",
"0.5.149",
"0.5.148",
"0.5.146",
"0.5.144",
"0.5.145",
"0.5.143",
"0.5.142",
"0.5.141",
"0.5.138",
"0.5.136",
"0.5.135",
"0.5.134",
"0.5.133",
"0.5.131",
"0.5.130",
"0.5.128",
"0.5.125",
"0.5.127",
"0.5.126",
"0.5.124",
"0.5.121",
"0.5.120",
"0.5.117",
"0.5.116",
"0.5.115",
"0.5.113",
"0.5.111",
"0.5.109",
"0.5.108",
"0.5.107",
"0.5.106",
"0.5.104",
"0.5.103",
"0.5.102",
"0.5.100",
"0.5.99",
"0.5.93",
"0.5.98",
"0.5.97",
"0.5.96",
"0.5.95",
"0.5.94",
"0.5.92",
"0.5.91",
"0.5.90",
"0.5.89",
"0.5.88",
"0.5.86",
"0.5.84",
"0.5.85",
"0.5.82",
"0.5.79",
"0.5.78",
"0.5.77",
"0.5.76",
"0.5.75",
"0.5.71",
"0.5.70",
"0.5.69",
"0.5.68",
"0.5.67",
"0.5.63",
"0.5.65",
"0.5.64",
"0.5.61",
"0.5.60",
"0.5.59",
"0.5.58",
"0.5.57",
"0.5.56",
"0.5.55",
"0.5.52",
"0.5.51",
"0.5.50",
"0.5.48",
"0.5.47",
"0.5.45",
"0.5.44",
"0.5.43",
"0.5.40",
"0.5.39",
"0.5.38",
"0.5.37",
"0.5.36",
"0.5.35",
"0.5.34",
"0.5.33",
"0.5.32",
"0.5.31",
"0.5.30",
"0.5.29",
"0.5.28",
"0.5.27",
"0.5.26",
"0.5.25",
"0.5.24",
"0.5.23",
"0.5.22",
"0.5.21",
"0.5.20",
"0.5.19",
"0.5.17",
"0.5.16",
"0.5.14",
"0.5.13",
"0.5.12",
"0.5.10",
"0.5.9",
"0.5.8",
"0.5.7",
"0.5.6",
"0.5.5",
"0.5.4",
"0.5.3",
"0.5.2",
"0.5.1",
"0.5.0",
"0.4.184",
"0.4.125",
"0.4.124",
"0.4.123",
"0.4.122",
"0.4.121",
"0.4.120",
"0.4.119",
"0.4.118",
"0.4.117",
"0.4.116",
"0.4.115",
"0.4.114",
"0.4.113",
"0.4.112",
"0.4.111",
"0.4.110",
"0.4.104",
"0.4.102",
"0.4.101",
"0.4.100",
"0.4.99",
"0.4.98",
"0.4.97",
"0.4.96",
"0.4.95",
"0.4.94",
"0.4.93",
"0.4.92",
"0.4.91",
"0.4.90",
"0.4.89",
"0.4.88",
"0.4.87",
"0.4.86",
"0.4.85",
"0.4.84",
"0.4.83",
"0.4.82",
"0.4.75",
"0.4.74",
"0.4.73",
"0.4.72",
"0.4.71",
"0.4.70",
"0.4.69",
"v0.4.68",
"0.4.68",
"0.4.67",
"0.4.66",
"0.4.65",
"0.4.64",
"0.4.63",
"0.4.62",
"0.4.61",
"0.4.60",
"0.4.59",
"0.4.58",
"0.4.57",
"0.4.55",
"0.4.54",
"0.4.53",
"0.4.52",
"0.4.51",
"0.4.47",
"0.4.46",
"0.4.45",
"0.4.44",
"0.4.43",
"0.4.42",
"0.4.41",
"0.4.40",
"0.4.37",
"0.4.35",
"0.4.34",
"0.4.33",
"0.4.32",
"0.4.31",
"0.4.30",
"0.4.29",
"0.4.28",
"0.4.27",
"0.4.26",
"0.4.25",
"0.4.24",
"0.4.23",
"0.4.22",
"0.4.21",
"0.4.20",
"0.4.19",
"0.4.18",
"0.4.16",
"0.4.15",
"0.4.14",
"0.4.13",
"0.4.12",
"0.4.11",
"0.4.10",
"0.4.8",
"0.4.7",
"0.4.6",
"0.4.5",
"0.4.4",
"0.4.3",
"0.4.2",
"0.4.1",
"0.3.19",
"0.3.18",
"0.3.16",
"0.3.15",
"0.3.12",
"0.3.11",
"0.3.10",
"0.3.9",
"0.3.8",
"0.3.7",
"0.3.6",
"0.3.5",
"0.3.4",
"0.3.3",
"0.3.2",
"0.3.1",
"0.3.0",
"0.2.0",
"0.1.14",
"0.1.13",
"0.1.12",
"0.1.11",
"0.1.10",
"0.1.9",
"0.1.8",
"0.1.7",
"0.1.6",
"0.1.5",
"0.1.4",
"0.1.3",
"0.1.2",
"0.1.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26539.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/apostrophecms/sanitize-html",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "b77e1d9c3875b387589c864c796ce31a75e436a9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:apostrophecms:sanitize-html:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.3.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"2.3.0",
"2.2.0",
"2.1.2",
"2.1.1",
"2.1.0",
"2.0.0",
"1.27.4",
"1.22.0",
"1.21.1",
"1.21.0",
"1.20.0",
"1.19.3",
"1.19.2",
"1.19.1",
"1.19.0",
"1.18.5",
"1.18.4",
"1.18.3",
"1.18.2",
"1.11.4",
"1.11.1",
"1.11.0",
"1.10.1",
"v1.9.0",
"v1.8.0",
"v1.7.2",
"v1.7.1",
"v1.7.0",
"v1.5.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26539.json"
}
}
],
"modified": "2026-10-24T10:47:54.254670608Z",
"provider": "osv",
"references": [
"https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#231-2021-01-22",
"https://github.com/apostrophecms/sanitize-html/pull/458",
"https://advisory.checkmarx.net/advisory/CX-2021-4308"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-26539",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441602,
"published_at": "2021-02-08T17:15:13.673+00:00"
}