CVE-2023-49105
Exploitation confirmed. First attested on 2026-08-27 by CISA-ADP, CISA KEV, GCVE · previdian.
- Published2023-11-21
- Fixed in10.13.1
- WeaknessCWE-287
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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
dates in UTC- 2023-11-2122:15CVE publishedNVD
- 2026-08-27Listed as exploited by GCVEGCVE
- 2026-08-27Exploitation first reportedCISA KEV
- 2026-08-27Added to the CISA KEV catalogCISA KEV
- 2026-08-2717:44SSVC exploitation set to activeCISA-ADP
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-49105?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-49105?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 10.x | ≥ 10.6.0, < 10.13.1 | 10.13.1 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Owncloud owncloud server to 10.13.1
- CISA’s required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-08-30
Advisories and patches
- owncloud.comVendor Advisory
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
CISA Known Exploited Vulnerability
- Date Added
- 2026-08-27
- Patch Due Date
- 2026-08-30
- Ransomware Use
- Unknown
- Required Action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Sources
- CISA KEVKEV entry2026-08-27
- GCVEexploitation2026-08-27
- CISA-ADPSSVC decisionactive2026-08-27
- OpenCVESSVC decisionactive—
- CNACVSS 3.19.8read 2026-10-23
- NVDCVSS 3.19.8read 2026-10-23
- CISA-ADPweakness (CWE)CWE-2872024-08-29
- NVDweakness (CWE)CWE-287read 2026-10-23
- FIRST EPSSEPSS score43.2 %read 2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2023-11-21
- Last Modified
- 2026-08-28
- NVD status
- Analyzed
Frequently asked questions
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.