CVE-2020-25789: 
Linux Debian vulnerability analysis and mitigation

An issue was discovered in Tiny Tiny RSS (aka tt-rss) before 2020-09-16. The cached_url feature mishandles JavaScript inside an SVG document (NVD, Debian Tracker).

The vulnerability has been assigned a CVSS v3.1 Base Score of 6.1 (MEDIUM) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation - Cross-site Scripting) (NVD).

The vulnerability allows for Cross-site Scripting (XSS) attacks through the mishandling of JavaScript code within SVG documents via the cached_url feature. This could potentially lead to unauthorized access to user data and compromise of user sessions (NVD).

The vulnerability requires user interaction and can be exploited remotely without authentication. The attack complexity is considered low, making it relatively straightforward to exploit (NVD).

The vulnerability was fixed in the version released on 2020-09-16. Users are advised to update to this version or later. The fix was implemented through a security patch and announced in the community forums (TT-RSS Community).

The vulnerability was responsibly disclosed by Daniel Neagaru and other employees of DigeeX. The TT-RSS developer acknowledged the quality of the vulnerability report and praised the clear and concise methodology provided by the security researchers (TT-RSS Community).