CVE-2023-49105

Summary

CVE	CVE-2023-49105
State	PUBLISHED
Assigner	mitre
Source Priority	CVE Program / NVD first with legacy fallback
Published	2023-11-21 22:15:08 UTC
Updated	2026-08-28 12:21:09 UTC
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.

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.432050000 probability, percentile 0.986630000 (date 2026-09-19)

CISA KEV: Listed on 2026-08-27; due 2026-08-30; ransomware use Unknown

Problem Types: CWE-287 | n/a | CWE-287 CWE-287 Improper Authentication

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
3.1	[email protected]	Secondary	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
3.1	CNA	DECLARED	9.8	CRITICAL	`CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N`

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor	ownCloud
Product	ownCloud
Name	ownCloud Improper Authentication Vulnerability
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.
Notes	https://owncloud.org/security ; https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2023-49105

Type	Vendor	Product	Version	Update	Edition	Language
Application	Owncloud	Owncloud Server	All	All	All	All

Source	Vendor	Product	Version	Platforms
CNA	Na	N/a	affected n/a	Not specified

Reference	Source	Link	Tags
www.cisa.gov/known-exploited-vulnerabilities-catalog	134c704f-9b21-4f2e-91b3-4a467353bcc0	www.cisa.gov	US Government Resource
hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contr...	134c704f-9b21-4f2e-91b3-4a467353bcc0	hunt.io	Third Party Advisory
ownCloud security policies and information	af854a3a-2127-422b-91ae-364da2661108	owncloud.org	Product
owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pr...	af854a3a-2127-422b-91ae-364da2661108	owncloud.com	Vendor Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis
CISA Known Exploited Vulnerabilities catalog	CISA	www.cisa.gov	kev

No vendor comments have been submitted for this CVE.

Source	Time	Event
ADP	2026-08-27T00:00:00.000Z	CVE-2023-49105 added to CISA KEV

There are currently no legacy QID mappings associated with this CVE.