CVE-2020-10254Network attack vector

Unauthenticated image access via preview bypass

Published Feb 19, 2021 · Updated Aug 4, 2024

Improper access control in ownCloud Server before 10.4 allows remote attackers to view password-protected image previews via public links. The preview-image endpoint omitted access-control enforcement, allowing retrieval when an attacker knows the public-link hash and original filename. Exploitation requires no account but does require those link details; the demonstrated impact is limited to disclosure of the protected image.

CVSS severity3.1
Low
EPSS probability1.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in ownCloud Server before 10.4 allows remote attackers to view password-protected image previews via public links. The preview-image endpoint omitted access-control enforcement, allowing retrieval when an attacker knows the public-link hash and original filename. Exploitation requires no account but does require those link details; the demonstrated impact is limited to disclosure of the protected image.

The record

CVE
CVE-2020-10254
Published
Feb 19, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2021CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1ownCloudCVSS:3.1/AV:N/AC:H/PR:N/UI:R/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

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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