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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-18526",
"assignerOrgId": "84fe0718-d6bb-4716-a7e8-81a6d1daa869",
"state": "PUBLISHED",
"assignerShortName": "Fluid Attacks",
"dateReserved": "2026-07-31T19:46:36.482Z",
"datePublished": "2026-08-19T14:17:00.896Z",
"dateUpdated": "2026-08-21T16:19:00.342Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"platforms": [
"Windows",
"MacOS",
"Linux"
],
"product": "HumHub",
"repo": "https://github.com/humhub/humhub",
"vendor": "HumHub",
"versions": [
{
"status": "affected",
"version": "1.18.4"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:humhub:humhub:1.18.4:*:windows:*:*:*:*:*",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:humhub:humhub:1.18.4:*:macos:*:*:*:*:*",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:humhub:humhub:1.18.4:*:linux:*:*:*:*:*",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Miguel Gomez"
},
{
"lang": "en",
"type": "finder",
"value": "Fluid Attacks' AI SAST Scanner"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "<span style=\"background-color: rgb(255, 255, 255);\">HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.</span><br>"
}
],
"value": "HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow."
}
],
"impacts": [
{
"capecId": "CAPEC-63",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-63 Cross-Site Scripting (XSS)"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "84fe0718-d6bb-4716-a7e8-81a6d1daa869",
"shortName": "Fluid Attacks",
"dateUpdated": "2026-08-19T14:17:00.896Z"
},
"references": [
{
"tags": [
"third-party-advisory"
],
"url": "https://fluidattacks.com/advisories/greeicy"
},
{
"tags": [
"product"
],
"url": "https://github.com/humhub/humhub"
},
{
"tags": [
"patch"
],
"url": "https://github.com/humhub/humhub/pull/8373"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-08-21T16:04:14.531056Z",
"id": "CVE-2026-18526",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-08-21T16:19:00.342Z"
}
}
]
}
}