CVE-2026-20172: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-rx97-pwc5-6v32
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CVSS 4.3
CWE-646
Published
Advisory Summary

CVE-2026-20172 is a MODERATE (CVSS 4.3) security vulnerability vulnerability (CWE-646: Reliance on File Name or Extension of Externally-Supplied File) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product allows a file to be uploaded, but it relies on the file name or extension of the file to determine the appropriate behaviors. this could be used by attackers to cause the file to be misclassified and processed in a dangerous fashion.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-20172 at a Glance

CVE Identifier CVE-2026-20172
GHSA Identifier GHSA-rx97-pwc5-6v32
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-646: Reliance on File Name or Extension of Externally-Supplied File
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-20172

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-20172, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-646: Reliance on File Name or Extension of Externally-Supplied File, where the product allows a file to be uploaded, but it relies on the file name or extension of the file to determine the appropriate behaviors. this could be used by attackers to cause the file to be misclassified and processed in a dangerous fashion. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability in the Lite Agent feature of Cisco Enterprise Chat and Email (ECE) could allow an authenticated, remote attacker to conduct browser-based attacks. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Agent. This vulnerability is due to inadequate validation of file contents during file upload operations. An attacker could exploit this vulnerability by uploading a file that contains malicious scripts or HTML code, which the application could make available to other users to access. A successful exploit could allow the attacker to execute the contents of that file in the browser of a user and conduct browser-based attacks. 

References

NVD — CVE-2026-20172 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20172
Software Security Information SECURITY
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-lite-agent-BCgSN8eb

Frequently Asked Questions

What is CVE-2026-20172?
CVE-2026-20172 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-646: Reliance on File Name or Extension of Externally-Supplied File.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-20172?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-20172?
CVE-2026-20172 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-20172?
CVE-2026-20172 is classified under CWE-646: Reliance on File Name or Extension of Externally-Supplied File (The product allows a file to be uploaded, but it relies on the file name or extension of the file to determine the appropriate behaviors. This could be used by attackers to cause the file to be misclassified and processed in a dangerous fashion.).
How can I check Maven dependencies for CVE-2026-20172?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rx97-pwc5-6v32",
  "modified" : "2026-05-06T18:30:31Z",
  "published" : "2026-05-06T18:30:31Z",
  "aliases" : [ "CVE-2026-20172" ],
  "details" : "A vulnerability in the Lite Agent feature of Cisco Enterprise Chat and Email (ECE) could allow an authenticated, remote attacker to conduct browser-based attacks. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Agent.\n\nThis vulnerability is due to inadequate validation of file contents during file upload operations. An attacker could exploit this vulnerability by uploading a file that contains malicious scripts or HTML code, which the application could make available to other users to access. A successful exploit could allow the attacker to execute the contents of that file in the browser of a user and conduct browser-based attacks. ",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-20172"
  }, {
    "type" : "WEB",
    "url" : "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-lite-agent-BCgSN8eb"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-646" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-06T17:16:20Z"
  }
}