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CVE-2020-26280

27
FAUCET Score

CVE-2020-26280 describes a persistent Cross-Site Scripting (XSS) vulnerability in OpenSlides version 3.2, a web-based presentation and assembly system. Due to insufficient user input validation and escaping, attackers can inject arbitrary JavaScript code into rich text fields, which then executes when other users view the affected text. This vulnerability carries a high CVSS score of 8.9, indicating a significant risk, as it can lead to session hijacking, manipulation of votes, or general disruption of meetings. While the vulnerability is easily exploitable with low attack complexity, there is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding it. The issue was patched in OpenSlides version 3.3.

Impacted Technologies

VendorProductVersion(s)CPE
3.2CPE matchmatch criteria
cpe:2.3:a:openslides:openslides:3.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.9HIGH

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 Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.35%
Probability of exploitation in next 30 days
EPSS Percentile
68.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0135 is in the 85th percentile among its peer group of 890 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

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