CVE-2026-20172 Cisco Enterprise Chat and Email Lite Agent File Upload Vulnerability
Authenticated attackers can upload malicious files to execute scripts in other users' browsers via the Lite Agent feature.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20172?
CVE-2026-20172 is a medium-severity cross-site scripting vulnerability in Cisco Enterprise Chat and Email, published on 6 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-646
Which versions are affected by CVE-2026-20172?
How do I fix CVE-2026-20172?
No fix has been published for CVE-2026-20172 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-20172 being exploited?
There is no known exploitation of CVE-2026-20172 in the wild and no public exploit code.
Sources
Also known as GHSA-rx97-pwc5-6v32.