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

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Nozomi Guardian and CMC up to 26.0.x. It has been rated as problematic. Affected by this issue is some unknown functionality of the component Content Security Policy Handler. This manipulation causes cross site scripting. This vulnerability is handled as CVE-2025-40904. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Nozomi Guardian and CMC up to 26.0.x. It has been declared as problematic. Affected by this vulnerability is an unknown function of the component Content Security Policy Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. As an impact it is known to affect integrity. The summary by CVE is:

A Stored HTML Injection vulnerability was discovered in the Smart Polling functionality due to improper validation of an input parameter. An authenticated user with limited privileges can push malicious remote strategies containing HTML tags through the sync. When a victim views the affected remote strategy in the Smart Polling functionality, 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 released with Stefano Libero/Andrea Palanca. It is possible to read the advisory at security.nozominetworks.com. This vulnerability is known as CVE-2025-40904 since 04/16/2025. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 26.1.0 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for 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: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.4
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector (Nozomi): 🔒

CVSSv2info

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

Exploitinginfo

Class: Cross site scripting
CWE: CWE-80 / CWE-74 / CWE-707
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-2025-40904 (🔒)
GCVE (CVE): GCVE-0-2025-40904
GCVE (VulDB): GCVE-100-364651

Entryinfo

Created: 05/19/2026 15:51
Updated: 05/23/2026 11:52
Changes: 05/19/2026 15:51 (77), 05/23/2026 11:52 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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