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CVE Record

CVE-2025-40904: HTML injection in Smart Polling in Guardian/CMC before 26.1.0

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.

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A flaw in Nozomi Networks Guardian and CMC lets an authenticated user with limited privileges insert HTML into Smart Polling remote strategies. When another user views the entry, that HTML renders in their browser and can be used to trick them with fake content or redirect them to attacker pages. Fixed in version 26.1.0.

Executive priority

Schedule a planned upgrade of Nozomi Guardian and CMC to 26.1.0 during the next maintenance window. Risk is moderate: no known active exploitation, but the flaw sits inside an OT monitoring console where operator trust matters. Treat as standard patch cycle, not emergency, unless untrusted low-privileged accounts exist.

Technical view

Stored HTML injection (CWE-79) in Smart Polling due to improper input validation. A low-privileged authenticated user can sync remote strategies containing HTML tags that render when a victim views them. Existing input filters and CSP prevent full XSS and direct data theft, but phishing and possible open-redirect abuse remain. CVSS 3.1 base 6.5 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L). Fixed in Guardian/CMC 26.1.0.

Likely exposure

Nozomi Networks Guardian and Central Management Console deployments prior to 26.1.0 where multiple operators share Smart Polling and remote strategy sync. OT/ICS monitoring environments used by industrial, energy, and manufacturing operators are the typical footprint; Siemens has co-published the advisory, indicating overlap with Siemens-integrated deployments.

Exploitation context

No public reports of exploitation and not listed in CISA KEV. Exploitation requires an authenticated low-privilege account plus victim interaction (viewing the poisoned strategy). Vendor notes CSP and input validation contain the impact to phishing lures and possible open redirects rather than session theft or code execution.

Researcher notes

Stored HTML injection scoped by CSP and input validation, so full XSS is reportedly not achievable. Attack chain: low-priv user pushes a crafted remote strategy via sync, victim renders it in Smart Polling view. Watch for CSP bypass research or open-redirect gadgets in the same UI. Siemens SSA-827968 co-advisory suggests exposure in Siemens-integrated Nozomi installs. Scope-changed CVSS reflects the cross-user rendering context.

Mitigation direction

  • Upgrade Guardian and CMC to version 26.1.0 or later per Nozomi advisory NN-2026:7-01.
  • Review Siemens SSA-827968 for guidance if using Siemens-integrated Nozomi deployments.
  • Restrict Smart Polling and remote strategy authoring to trusted operator roles.
  • Audit existing user accounts and remove or downgrade unnecessary low-privilege access.
  • Reinforce user awareness that operator UI content can be attacker-controlled until patched.

Validation and detection

  • Inventory Guardian and CMC instances and record installed versions against 26.1.0.
  • Confirm patch deployment through the appliance version banner or management API.
  • Review Smart Polling remote strategies for unexpected HTML markup in strategy fields.
  • Check web server and audit logs for anomalous strategy sync activity from low-privilege users.
  • Verify CSP headers remain enabled on the management UI post-upgrade.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2025-40904 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
3Timeline events
2ADP providers
3Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L2.33.7Nozomi
5.1CVSS 4.0MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L——Nozomi

Vulnerability scoring details

Base CVSS 4.0 score

5.1Medium
CVSS 4.0 vector shape for CVE-2025-40904Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Nozomi NetworksGuardian0unaffected
Nozomi NetworksCMC0unaffected
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.