B2Evolution · B2Evolution · CVE-2017-5539
**Name of the Vulnerable Software and Affected Versions**
b2evolution version 6.8.4-stable
**Description**
The issue allows an attacker to bypass a filter rule using `../`, enabling them to delete or read any files on the server, as well as determine whether a file exists.
**Recommendations**
For b2evolution version 6.8.4-stable, as a temporary workaround, consider restricting access to sensitive files and directories until a patch is available. Avoid using the `../` sequence in file paths to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.