Nozomi Guardian/CMC up to 26.0.x cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Nozomi Guardian and CMC up to 26.0.x. The impacted element is an unknown function. This manipulation causes cross site scripting. This vulnerability is tracked as CVE-2025-40903. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Nozomi Guardian and CMC up to 26.0.x and classified as problematic. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

A Stored HTML Injection vulnerability was discovered in the Schedule Restore Archive functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can define a malicious restore schedule containing HTML tags. When a victim views the affected schedule, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

The weakness was disclosed with Stefano Libero/Andrea Palanca. The advisory is shared at security.nozominetworks.com. This vulnerability is known as CVE-2025-40903 since 04/16/2025. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 26.1.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 2.4
VulDB Temp Score: 2.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.8
NVD Vector: 🔒

CNA Base Score: 5.9
CNA Vector (Nozomi): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Guardian/CMC 26.1.0

Timelineinfo

04/16/2025 CVE reserved
05/19/2026 +398 days Advisory disclosed
05/19/2026 +0 days VulDB entry created
05/23/2026 +4 days VulDB entry last update

Sourcesinfo

Advisory: security.nozominetworks.com
Organization: Stefano Libero/Andrea Palanca
Status: Confirmed

CVE: CVE-2025-40903 (🔒)
GCVE (CVE): GCVE-0-2025-40903
GCVE (VulDB): GCVE-100-364657

Entryinfo

Created: 05/19/2026 15:53
Updated: 05/23/2026 11:52
Changes: 05/19/2026 15:53 (76), 05/23/2026 11:52 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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