- 4.3MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By cisco
- 7 months later
· 7 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Affected products
Cisco · Cisco Enterprise Chat and Email
- affected 11.6(1)_ES3
- affected 11.6(1)_ES4
- affected 12.0(1)_ES6
- affected 11.6(1)_ES8
- affected 12.0(1)_ES5a
- affected 11.6(1)_ES9
- affected 12.0(1)_ES6_ET1
- affected 11.6(1)_ES6
- affected 11.6(1)_ES5
- affected 12.5(1)_ET1
- affected 12.5(1)
- affected 12.5(1)_ES3_ET1
- affected 12.0(1)_ES3
- affected 11.6(1)_ES11
- affected 12.0(1)_ES4
- affected 12.0(1)_ES5
- affected 11.6(1)_ES2
- affected 11.6(1)_ES9a
- affected 11.6(1)_ES10
- affected 12.0(1)_ES1
- affected 12.0(1)
- affected 12.5(1)_ES3
- affected 12.6(1)
- affected 11.5(1)
- affected 12.0(1)_ES2
- affected 11.6(1)_ES7
- affected 12.5(1)_ES2
- affected 12.6(1)_ET1
- affected 11.6(1)
- affected 12.5(1)_ES1
- affected 12.6(1)_ET2
- affected 12.5(1)_ES3_ET2
- affected 12.0(1)_ES6_ET2
- affected 12.6(1)_ES1
- affected 12.5(1)_ES4
- affected 11.6(1)_ES12
- affected 12.6(1)_ET3
- affected 12.5(1)_ES4_ET1
- affected 12.0(1)_ES6_ET3
- affected 12.6(1)_ES1_ET1
- and 59 more
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-27856 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-20172)Record last updated .