CVE-2020-8121: nextcloud nextcloud_server Improper Access Control
CVSS: 8.1v3.1HighModified
Published 04-02-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-8121 is a high (CVSS 8.1) Improper Access Control vulnerability in nextcloud nextcloud_server. EPSS estimates a 1.04% chance of exploitation in the next 30 days, higher than 63.3% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
8.1/10
010
High · v3.1 (NVD)EPSS score
1.04%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 04-02-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A bug in Nextcloud Server 14.0.4 could expose more data in reshared link shares than intended by the sharer.
CVSS metrics
2 scores · 1 source · 2 versionsHigh 8.1Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NSourcesSingle source
Medium 5.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:P/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.04%
Chance of exploitation in the next 30 days
Percentile
63%
Versus all other CVEs
30-day change
0.00 pp
From 1.04% on 19-09-2026
19-09-202619-10-2026
EPSS score1.04%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (hackerone.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-284Improper Access ControlThe product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
- CWE-668Exposure of Resource to Wrong SphereThe product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.
Affected systems
Nextcloud1 product
- nextcloud_server< 13.0.9 | ≥ 14.0.0, < 14.0.5 | ≥ 14.0.6, < 15.0.0
1 vendor · 1 product