Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.
Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:HI:NA:L8.2/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:LInput Validation