# CVE-2023-49105 — Owncloud Server

> As of 2024-08-29, CVE-2023-49105 is a CRITICAL-severity vulnerability in Owncloud Server, CVSS v3.1 9.8, EPSS 11.0% (95.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-49105, most recently “Suspected Chinese-Speaking Threat Actor Exploits ownCloud and WordPress Flaws to Steal Philippine Nuclear and Naval Data”.

**Last updated:** 2024-08-29

## What is CVE-2023-49105?

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.

The record classifies CVE-2023-49105 under weakness class [CWE-287](https://intel.threadlinqs.com/cwe/CWE-287). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1049 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N`)
- **EPSS (FIRST):** 11.0% probability of exploitation in the next 30 days, higher than 95.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2023-11-21, last modified 2024-08-29

## Is CVE-2023-49105 being exploited?

Weaponised exploit code for CVE-2023-49105 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier.

- [ambionics/owncloud-exploits](https://github.com/ambionics/owncloud-exploits) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2023/CVE-2023-49105.md) (trickest)

## Affected products and versions

- **Owncloud**: Server

## How to fix CVE-2023-49105

Vendor advisory: [https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/](https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2023-49105

1 tracked threat in the Threadlinqs corpus references CVE-2023-49105, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Suspected Chinese-Speaking Threat Actor Exploits ownCloud and WordPress Flaws to Steal Philippine Nuclear and Naval Data](https://intel.threadlinqs.com/threat/TL-2026-2172) — CRITICAL · 2026-08-27

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-08-27. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [owncloud.org](https://owncloud.org/security)
- [owncloud.com](https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2023-49105
Full detection coverage and IOCs for threats exploiting CVE-2023-49105 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp