ownCloud Improper Authentication Vulnerability

ownCloud ownCloud

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 CISA KEV on 2026-08-27 (federal deadline 2026-08-30).

First seen: 27 Aug 2026
Last update: 27 Aug 2026, 12:00 UTC
Identifiers: CVE-2023-49105
Source: CISA KEV

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## ownCloud Improper Authentication Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: ownCloud ownCloud
Ids: CVE-2023-49105

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 CISA KEV on 2026-08-27 (federal deadline 2026-08-30).

## Steps
1. Search the repo, its CI and infra config for ownCloud ownCloud. If present, report the version in use and whether it's affected.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2023-49105") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://nvd.nist.gov/vuln/detail/CVE-2023-49105 https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ https://owncloud.org/security
https://pwned.coffee/i/owncloud-improper-authentication-vulnerability-cve-2023-49105

Sources

Totalone hot coffee