Home/CVE/A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack usi
CVE

CVE-2020-8294

A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack usi

A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.

MEDIUM · CVSS 5.4 EPSS 0.00391
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

3
nextcloud server< 18.0.11
nextcloud server>= 19.0.0 and < 19.0.5
nextcloud server>= 20.0.0 and < 20.0.2
▣

Scoring & Timeline

5.4
MEDIUM · CVSS v3.1 · support@hackerone.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Feb 2021 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
⚑

Vendor Advisories

3
suse-csafopenSUSE-SU-2021:1068-1
suse-csafopenSUSE-SU-2021:0274-1
suse-csafopenSUSE-SU-2021:0262-1
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://hackerone.com/reports/1023787Permissions RequiredThird Party Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2021-002Vendor Advisory
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