CVE-2020-26280

HIGH EPSS 61.6%
Published Dec 18, 20205y ago · Modified Jun 17, 20262w ago
8.9 CVSS 3.1
High
Find Similar
Published Dec 18, 2020 5y ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
8.9
Exploitability
2.3
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality High
Integrity High
Availability Low

Threat Intelligence

EPSS Exploit Probability
61.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
openslidesopenslides3.2any

References 5

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

Remediation

  • github.com https://github.com/OpenSlides/OpenSlides/commit/f3809fc8a97ee305d721662a75f788f9e9d21938
    PatchThird Party Advisory
  • github.com https://github.com/OpenSlides/OpenSlides/pull/5714
    PatchThird Party Advisory