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Vulnerabilities

Security incident · CVE-2025-40891

A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data.

Published Dec 18, 2025 · catalog updated Aug 11, 2026 · Nozomi Networks CMC

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2025-40891 is not in CISA KEV. FIRST estimates a 18.00% chance of exploitation in the next 30 days. Check whether you run Nozomi Networks CMC.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low2.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
18.00%
Remediation
Version ranges on file
Affected products
vendor Nozomi Networks CMC 0 <25.5.0

A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those specific snapshots and perform specific GUI actions, at which point the injected HTML renders in their browser, enabling phishing and open redirect attacks. Full XSS exploitation is prevented by input va

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Nozomi Networks CMC 0 <25.5.00 <25.5.0

How to fix CVE-2025-40891

  • Upgrade

    CVE-2025-40891 lists a fix boundary at 25.5.0. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in 0 <25.5.0

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-40891 is not in CISA KEV. FIRST estimates a 18.00% chance of exploitation in the next 30 days. Check whether you run Nozomi Networks CMC.

Which versions are affected?

Compare what you have installed with Nozomi Networks CMC 0 <25.5.0 0 <25.5.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 18.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 18, 2025 · EUVD

    Detected

    A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those spe

  2. Aug 11, 2026 · EUVD

    Updated

    A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those spe

Sources

  • EUVDVulnerability recordEUVD-2025-204261

    A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset at

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Aug 11, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • EUVDOct 29, 2026