Fortra Cobalt Strike Teamserver Cross-Site Scripting (XSS) Vulnerability

Added to KEV
2023-03-30
Federal due date
2023-04-20
Vendor
Fortra
Product
Cobalt Strike
EPSS
95.5th percentile (score 0.196, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2022-39197

CISA short description

Fortra Cobalt Strike contains a cross-site scripting (XSS) vulnerability in Teamserver that would allow an attacker to set a malformed username in the Beacon configuration, allowing them to execute code remotely.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.