CVE-2025-40902: A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of

Q: How do I fix CVE-2025-40902?

cmc: upgrade to 26.1.0; guardian: upgrade to 26.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-40902 being exploited?

CVE-2025-40902 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-2025-40902 affect?

CVE-2025-40902 affects cmc, guardian. Severity is medium (CVSS 5.9). A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can create a malicious user whose username contains HTML

Q: How urgent is CVE-2025-40902?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 5.9UPGRADEUPGRADE

CVE-2025-40902 is a medium-severity flaw (CVSS 5.9) affecting cmc, guardian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can create a malicious user whose username contains HTML tags. When a victim attempts to delete a group containing the affected user, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct in

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-19
Last modified	2026-10-14

Publisher (CNA): Nozomi Networks Inc. · Vendor: nozominetworks

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 14:16 UTCPublished CVE record published
2026-10-14 13:10 UTCUpdated Record last modified

nozominetworks cmc UPGRADE

Affected: < 26.1.0

Fixed in: 26.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cmc || rpm -q cmc || cmc --version

2. UPGRADE to 26.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cmc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cmc

Note

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

nozominetworks guardian UPGRADE

Affected: < 26.1.0

Fixed in: 26.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy guardian || rpm -q guardian || guardian --version

2. UPGRADE to 26.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade guardian

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade guardian

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-2025-40902?

cmc: upgrade to 26.1.0; guardian: upgrade to 26.1.0. Exact commands for each OS are on this page.

Is CVE-2025-40902 being exploited?

CVE-2025-40902 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-2025-40902 affect?

CVE-2025-40902 affects cmc, guardian. Severity is medium (CVSS 5.9). A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can create a malicious user whose username contains HTML

How urgent is CVE-2025-40902?

Priority 23/100. No elevated risk signals yet.

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References

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