CVE-2025-70545Public exploitNetwork attack vector

Stored JavaScript execution via unneutralized browserLang input

Published Feb 4, 2026 · Updated Feb 4, 2026

Stored XSS in the PPC (Belden) ONT 2K05X web interface on firmware 1.1.9_206L allows remote attackers to execute JavaScript. The CGI backend stores an unneutralized browserLang parameter and later renders it into the management page, where the browser executes it. No authentication is required to plant the payload, but a user must subsequently open the affected interface; the script then runs in that user's browser context.

CVSS severity6.1
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the PPC (Belden) ONT 2K05X web interface on firmware 1.1.9_206L allows remote attackers to execute JavaScript. The CGI backend stores an unneutralized browserLang parameter and later renders it into the management page, where the browser executes it. No authentication is required to plant the payload, but a user must subsequently open the affected interface; the script then runs in that user's browser context.

The record

CVE
CVE-2025-70545
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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