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CVE-2018-3780

20
FAUCET Score

CVE-2018-3780 describes a stored cross-site scripting (XSS) vulnerability in NextCloud Server versions prior to 13.0.5, stemming from a lack of sanitization in autocomplete search results for usernames. This medium-severity vulnerability (CVSS 5.4) requires an authenticated attacker and user interaction, with potential impacts on confidentiality and integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 13.0.5CPE 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
0.89%
Probability of exploitation in next 30 days
EPSS Percentile
55.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0089 is in the 90th percentile among its peer group of 15,225 CVEs.

Social Chatter

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/383117
Third Party Advisory
nextcloud.com / security/advisory
Vendor Advisory