Missing Authorization in EC2 Fleet - CVE-2026-57294
Published: June 29, 2026
Vulnerability identifier: #VU135788
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57294
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to improper authorization checks in several HTTP endpoints. A remote user can connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method.
Affected software
EC2 Fleet
How to mitigate CVE-2026-57294
Install updates from vendor's website.
EC2 Fleet - update to 4.2.3.540.va_6eedb_7b_c112