CVE-2026-1011 (GCVE-0-2026-1011)
Vulnerability from cvelistv5 – Published: 2026-01-15 23:08 – Updated: 2026-01-16 22:19
VLAI?
Title
Stored Cross-Site Scripting in Altium Support Center Comment Endpoint
Summary
A stored cross-site scripting (XSS) vulnerability exists in the Altium Support Center AddComment endpoint due to missing server-side input sanitization. Although the client interface applies HTML escaping, the backend accepts and stores arbitrary HTML and JavaScript supplied via modified POST requests.
The injected content is rendered verbatim when support cases are viewed by other users, including support staff with elevated privileges, allowing execution of arbitrary JavaScript in the victim’s browser context.
Severity ?
6.1 (Medium)
CWE
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Altium | Altium 365 |
Affected:
unspecified
|
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"modules": [
"Support case comment rendering (AddComment endpoint)"
],
"platforms": [
"Web"
],
"product": "Altium 365",
"vendor": "Altium",
"versions": [
{
"status": "affected",
"version": "unspecified"
}
]
}
],
"datePublic": "2026-01-15T23:01:00.000Z",
"descriptions": [
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"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "A stored cross-site scripting (XSS) vulnerability exists in the Altium Support Center AddComment endpoint due to missing server-side input sanitization. Although the client interface applies HTML escaping, the backend accepts and stores arbitrary HTML and JavaScript supplied via modified POST requests.\u003cbr\u003e\u003cbr\u003eThe injected content is rendered verbatim when support cases are viewed by other users, including support staff with elevated privileges, allowing execution of arbitrary JavaScript in the victim\u2019s browser context.\u003cbr\u003e\u003cbr\u003e"
}
],
"value": "A stored cross-site scripting (XSS) vulnerability exists in the Altium Support Center AddComment endpoint due to missing server-side input sanitization. Although the client interface applies HTML escaping, the backend accepts and stores arbitrary HTML and JavaScript supplied via modified POST requests.\n\nThe injected content is rendered verbatim when support cases are viewed by other users, including support staff with elevated privileges, allowing execution of arbitrary JavaScript in the victim\u2019s browser context."
}
],
"impacts": [
{
"capecId": "CAPEC-63",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-63 Cross-Site Scripting"
}
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},
{
"capecId": "CAPEC-98",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-98 Phishing"
}
]
}
],
"metrics": [
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
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}
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}
],
"problemTypes": [
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"descriptions": [
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"cweId": "CWE-79",
"description": "CWE-79 Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-116",
"description": "CWE-116 Improper Encoding or Escaping of Output",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-16T22:19:11.645Z",
"orgId": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79",
"shortName": "Altium"
},
"references": [
{
"url": "https://www.altium.com/platform/security-compliance/security-advisories"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Stored Cross-Site Scripting in Altium Support Center Comment Endpoint",
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
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"cveMetadata": {
"assignerOrgId": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79",
"assignerShortName": "Altium",
"cveId": "CVE-2026-1011",
"datePublished": "2026-01-15T23:08:01.260Z",
"dateReserved": "2026-01-15T22:08:48.882Z",
"dateUpdated": "2026-01-16T22:19:11.645Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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