An issue was discovered in ownCloud owncloud/core before 10.13.1.
Affects ownCloud core 10.6.0 through 10.13.0 when no signing-key is configured, which is the default. Fixed in 10.13.3.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 10.13.3
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
ownCloud Server (owncloud/core) is affected, allowing an unauthenticated attacker who knows a victim's username to access, modify, or delete that victim's files when the victim has no signing key configured. The flaw lies in accepting pre-signed URLs without a valid signing key, which exposes users' stored data to unauthorized changes and loss.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- Record last updated
- CISA remediation deadline
Due date for US federal agencies to patch
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- n/a n/a
Version range not reported
References 2
owncloud.org
Questions about CVE-2023-49105
What does this mean?
The flaw lets anyone access, modify or delete any file on the server without authentication. The advisory notes that the attacker needs to know the username of the target.Source: owncloud.com, owncloud.com
Am I affected, and how do I check?
ownCloud core versions 10.6.0 through 10.13.0 are affected when the victim has no signing-key configured, which is the default. To check, compare the installed ownCloud core version against that range and check whether a signing-key is set.Source: owncloud.com, owncloud.com
What should I do about it?
Upgrade to ownCloud core 10.13.3, or apply the specific patch available from the ownCloud support team.Source: owncloud.com, owncloud.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-27, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data