CVE-2026-9397CWE-266CWE-285

Besen BS20 EV Charging Station OTA Update Installation improper authorization

Critical · published May 24, 2026

CVSS v4.0
9.2
EPSS
1%
Percentile
55.0
In the wild
Unconfirmed
What it is

A weakness has been identified in Besen BS20 EV Charging Station up to 20260426. Affected by this issue is some unknown functionality of the component OTA Update Installation Handler. This manipulation causes improper authorization. The attack is possible to be carried out remotely. A high degree of complexity is needed for the attack. The exploitation is known to be difficult. The original disclosure mentions, that "[t]hese vulnerabilities have been reported to Besen and we have received their acknowlegement that they are reviewing this as of April 2026."

The record
Technical detail
CVSS v4.0
9.2 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
EPSS
0.00765 · 55.0th percentile
Weaknesses
CWE-266 · Incorrect Privilege Assignment; CWE-285 · Improper Authorization
Published
2026-05-24T20:30Z
EPSS history
Timeline
  • 24 MAY 20:30Z
    Besen BS20 EV Charging Station OTA Update Installation improper authorization
    cvelistv5