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CVE-2023-49105

ownCloud Improper Authentication

9.8 CRITICALActively exploited (CISA KEV)EPSS 42.9%
  1. Published21 Nov 2023
  2. Added to CISA KEV27 Aug 2026
  3. Remediation due30 Aug 2026
Actively exploited (CISA KEV)

ownCloud contains an improper authentication vulnerability that allows an attacker to access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured.

Added to KEV: 27 Aug 2026Federal remediation due: 30 Aug 2026

Description

An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured. This occurs because pre-signed URLs can be accepted even when no signing-key is configured for the owner of the files. The earliest affected version is 10.6.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Owncloud Server≥ 10.6.0 < 10.13.1

Remediation

Fixed in
Owncloud Server≥ 10.13.1

References

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Frequently asked

Is CVE-2023-49105 being actively exploited?

Yes. CVE-2023-49105 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 27 Aug 2026.

How severe is CVE-2023-49105?

CVE-2023-49105 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 42.9% probability of exploitation.

Which products are affected by CVE-2023-49105?

Affected products include Owncloud Server.

How do I fix CVE-2023-49105?

Upgrade affected software to a fixed version, for example Owncloud Server 10.13.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-49105 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.