CVE-2020-8155 : An outdated 3rd party library in the Files PDF viewer for Nextcloud Server 18.0.

An outdated 3rd party library in the Files PDF viewer for Nextcloud Server 18.0.2 caused a Cross-site scripting vulnerability when opening a malicious PDF.

Published 2020-05-12 13:15:13

Updated 2020-10-19 19:15:16

Source HackerOne

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2020-8155

Nextcloud » Nextcloud Server
Versions before (<) 18.0.3
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2020-8155

EPSS FAQ

0.10%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 42 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-8155

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.5	LOW	AV:N/AC:M/Au:S/C:N/I:P/A:N	6.8	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: Single Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	2.3	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2020-8155

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

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Assigned by:
- nvd@nist.gov (Primary)
- support@hackerone.com (Secondary)

References for CVE-2020-8155

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00019.html

[security-announce] openSUSE-SU-2020:1652-1: moderate: Security update f

CVEs referencing this url
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00038.html

[security-announce] openSUSE-SU-2020:0668-1: moderate: Security update f

CVEs referencing this url
https://nextcloud.com/security/advisory/?id=NC-SA-2020-019

advisory – Nextcloud
Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/

[SECURITY] Fedora 32 Update: nextcloud-18.0.9-1.fc32 - package-announce - Fedora Mailing-Lists

CVEs referencing this url
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00037.html

[security-announce] openSUSE-SU-2020:0667-1: moderate: Security update f

CVEs referencing this url
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00040.html

[security-announce] openSUSE-SU-2020:0670-1: moderate: Security update f

CVEs referencing this url

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Vulnerability Details : CVE-2020-8155

Products affected by CVE-2020-8155

Exploit prediction scoring system (EPSS) score for CVE-2020-8155

CVSS scores for CVE-2020-8155

CWE ids for CVE-2020-8155

References for CVE-2020-8155