Security readout for executives and security teams
Plain-English summary
CVE-2026-1011 is a stored cross-site scripting issue in Altium Live Support Center comments. Malicious content submitted to a support case can be saved and later run in another viewer’s browser, including support staff. Business impact is mainly account/session risk, data exposure in the portal, and workflow integrity concerns.
Executive priority
Treat as a moderate-priority web application risk. It is not confirmed as actively exploited, but it can affect support staff and portal trust. Assign ownership to the team managing Altium support interactions and monitor vendor guidance for remediation details.
Technical view
The AddComment endpoint lacks server-side input sanitization. Client-side HTML escaping is insufficient because the backend accepts and stores arbitrary HTML/JavaScript, then renders it when cases are viewed. CVSS is 6.1, network-accessible, low complexity, no privileges required, but requires user interaction and has limited confidentiality and integrity impact.
Likely exposure
Organizations using Altium Live Support Center case comments may be exposed. The provided record lists Altium Live but gives version data as “0” and default status as unaffected, so affected deployment scope is not fully clear from the sources.
Exploitation context
The CVE is not listed as CISA KEV, and the provided sources do not report active exploitation. Practical abuse would require a victim to view a case containing stored malicious content. Higher concern applies where support staff or privileged users regularly review externally submitted cases.
Researcher notes
Evidence supports stored XSS in the AddComment path, with backend validation failure despite client-side escaping. Affected-version metadata is incomplete and internally ambiguous. Do not assume exploit activity or patch availability from the provided record; rely on Altium’s advisory page for authoritative remediation status.
Mitigation direction
- Check Altium’s security advisories for the official fix or mitigation guidance.
- Restrict Support Center case access to trusted users where operationally feasible.
- Review support workflows for untrusted comment content until vendor guidance is confirmed.
- Prioritize server-side sanitization and output encoding if managing affected custom components.
Validation and detection
- Confirm whether your organization uses Altium Live Support Center comments.
- Review Altium advisory updates for affected service scope and remediation status.
- Check support cases for unexpected HTML or script-like content.
- Verify controls sanitize input server-side and encode output on render.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-116: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-1011 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.altium.com/platform/security-compliance/security-advisoriesCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.