CVE-2026-1011
Stored Cross-Site Scripting in Altium Support Center Comment Endpoint
Description
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.
INFO
Published Date :
Jan. 16, 2026, 12:16 a.m.
Last Modified :
Jan. 16, 2026, 12:16 a.m.
Remotely Exploit :
Yes !
Source :
4760f414-e1ae-4ff1-bdad-c7a9c3538b79
Affected Products
The following products are affected by CVE-2026-1011
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 4760f414-e1ae-4ff1-bdad-c7a9c3538b79 | ||||
| CVSS 3.1 | MEDIUM | 4760f414-e1ae-4ff1-bdad-c7a9c3538b79 |
Solution
- Implement robust server-side input sanitization for all data.
- Validate and sanitize user-supplied HTML and JavaScript.
- Configure security headers to mitigate XSS risks.
- Review and update relevant endpoint configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1011.
| URL | Resource |
|---|---|
| https://www.altium.com/platform/security-compliance/security-advisories |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1011 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1011
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1011 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-1011 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 4760f414-e1ae-4ff1-bdad-c7a9c3538b79
Jan. 16, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CWE CWE-79 Added CWE CWE-116 Added Reference https://www.altium.com/platform/security-compliance/security-advisories