This security advisory describes one high risk vulnerability.
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]
Exploit availability: NoDescription
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to insufficient validation of file during file upload. A remote attacker can upload a malicious PHP file and execute it on the server.
Additionally, it's recommended that you audit all previously uploaded
files to check for malicious extensions. Look specifically for files
that include more than one extension, like
Pay specific attention to the following file extensions, which should
be considered dangerous even when followed by another extension:
Install update from vendor's website.
Backdrop CMS: 1.15.0, 1.15.0-preview, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0, 1.16.0-preview, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.17.0, 1.17.1, 1.17.2CPE
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.