CVE-2020-26280 Information

Description

OpenSlides is a free Web-based presentation and assembly system for managing and projecting agenda motions and elections of assemblies. OpenSlides version 3.2 due to unsufficient user input validation and escaping it is vulnerable to persistant cross-site scripting (XSS). In the web applications users can enter rich text in various places e.g. for personal notes or in motions. These fields can be used to store arbitrary JavaScript Code that will be executed when other users read the respective text. An attacker could utilize this vulnerability be used to manipulate votes of other users hijack the moderators session or simply disturb the meeting. The vulnerability was introduced with 6eae497abeab234418dfbd9d299e831eff86ed45 on 16.04.2020 which is first included in the 3.2 release. It has been patched in version 3.3 ( in commit f3809fc8a97ee305d721662a75f788f9e9d21938 merged in master on 20.11.2020).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

Reference

https://github.com/OpenSlides/OpenSlides/security/advisories/GHSA-w5wr-98qm-jx92 https://github.com/OpenSlides/OpenSlides/blob/master/CHANGELOG.rst#version-33-2020-12-18 https://github.com/OpenSlides/OpenSlides/pull/5714 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-043.txt https://github.com/OpenSlides/OpenSlides/commit/f3809fc8a97ee305d721662a75f788f9e9d21938

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

LOW

Base Severity

8.9