CVE-2026-1011: A stored cross-site scripting (XSS) vulnerability exists in the Altium Support Center AddComment endpoint due

Q: How do I fix CVE-2026-1011?

altium live: upgrade to newer than 1.1.1.39. Exact commands for each OS are on this page.

Q: Is CVE-2026-1011 being exploited?

CVE-2026-1011 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-1011 affect?

CVE-2026-1011 affects altium live. Severity is medium (CVSS 6.1). 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 arb

Q: How urgent is CVE-2026-1011?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-1011 is a medium-severity flaw (CVSS 6.1) affecting altium live. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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, allowin

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-79, CWE-116
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): Altium · Vendor: altium

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-16 00:16 UTCPublished CVE record published
2026-06-17 10:14 UTCUpdated Record last modified

altium altium live UPGRADE

Affected: <= 1.1.1.39

Fixed in: newer than 1.1.1.39

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy altium-live || rpm -q altium-live || altium-live --version

2. UPGRADE to newer than 1.1.1.39 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade altium-live

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade altium-live

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-1011?

altium live: upgrade to newer than 1.1.1.39. Exact commands for each OS are on this page.

Is CVE-2026-1011 being exploited?

CVE-2026-1011 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-1011 affect?

CVE-2026-1011 affects altium live. Severity is medium (CVSS 6.1). 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 arb

How urgent is CVE-2026-1011?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2026-1009 CRITICAL 9.0 DOWNGRADE A stored cross-site scripting (XSS) vulnerability exists in the Altium Forum due to missing server-side input
CVE-2026-1008 HIGH 7.6 DOWNGRADE A stored cross-site scripting (XSS) vulnerability exists in the user profile text fields of Altium 365

References

← Back to latest CVEs