CVE-2020-8117Network attack vector

Private event disclosure via lost sharing permissions

Published Feb 4, 2020 · Updated Aug 4, 2024

Improper permission preservation in Nextcloud Server 14.0.3 allows remote authenticated users to read private event details. Nextcloud has not published the affected function or the operation that fails to retain the event's non-public permissions during calendar sharing. An account must be able to share the non-public event; exposure is limited to its event details, with no reported modification or service interruption.

CVSS severity4.8
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper permission preservation in Nextcloud Server 14.0.3 allows remote authenticated users to read private event details. Nextcloud has not published the affected function or the operation that fails to retain the event's non-public permissions during calendar sharing. An account must be able to share the non-public event; exposure is limited to its event details, with no reported modification or service interruption.

The record

CVE
CVE-2020-8117
Published
Feb 4, 2020
Updated
Aug 4, 2024
Vendor
Nextcloud GmbH
Product
Nextcloud Server
Classifications
CWE-281
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=14.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Nextcloud Serverversion=14.0.4

Published CVSS scores

4.8Nextcloud GmbHCVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-281Improper Preservation of Permissions

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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