CVE-2026-20172
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 2% of all known CVEs.
References
Related Vulnerabilities
Other CWE-646 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-34639 | High | 7.5 | 0.6% | - | - |
| CVE-2024-52052 | High | 7.2 | 0.5% | - | Fix |
| CVE-2025-1889 | Critical | 9.8 | 0.4% | - | Fix |
| CVE-2025-58449 | Unscored | - | 0.3% | - | - |
| CVE-2023-45599 | Medium | 5.5 | 0.2% | - | Fix |
| CVE-2026-45315 | High | 8.7 | 0.2% | - | Fix |
Common questions
How do I fix CVE-2026-20172?
No published fix for CVE-2026-20172 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-20172 being actively exploited?
Not that we know of. CVE-2026-20172 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 2% of all scored CVEs.
How severe is CVE-2026-20172?
CVE-2026-20172 has a CVSS v3 base score of 4.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.