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CVE-2017-0891

15
FAUCET Score

CVE-2017-0891 describes a cross-site scripting (XSS) vulnerability in Nextcloud Server versions prior to 9.0.58, 10.0.5, and 11.0.3, stemming from inadequate escaping of error messages across multiple components. Rated Medium with a CVSS score of 5.4, this vulnerability requires low privileges and user interaction, allowing an attacker to potentially achieve limited confidentiality and integrity impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 9.0.58CPE matchmatch criteria
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
>= 10.0.0, < 10.0.5CPE matchmatch criteria
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
>= 11.0.0, < 11.0.3CPE matchmatch criteria
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.4MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.64%
Probability of exploitation in next 30 days
EPSS Percentile
47.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0064 is in the 79th percentile among its peer group of 15,222 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

hackerone.com / reports/216812
Third Party AdvisoryVDB Entry
nextcloud.com / security/advisory
Vendor Advisory