Is CVE-2023-49105 actively exploited?

Yes. Previdian tracks CVE-2023-49105 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has Previdian observed?

Previdian has not yet recorded sensor-observed exploitation attempts for CVE-2023-49105. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

Version-level data is not available; Previdian tracks ownCloud ownCloud.

Yes. CVE-2023-49105 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2023-49105

ownCloud

ownCloud / ownCloud

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Severity: CVSS 9.8 · Critical
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 11.1%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2023-49105 is an unauthenticated vulnerability affecting ownCloud ownCloud. An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify, or delete any file without...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

ownCloud / ownCloud.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

An issue was discovered in ownCloud owncloud/core before 10.13.1

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.

Published: 21 Nov 2023
Exploitation Reported: 27 Aug 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2023-49105
owncloud.org/security owncloud.org · CVE Record https://owncloud.org/security
owncloud.com/security-advisories/webdav-api-authenticatio... owncloud.com · CVE Record https://owncloud.com/security-advisories/webdav-api-authentication-by...

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 27 Aug 2026

Independent exploitation attestation added to the Previdian record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source	Added
CISA First	2026-08-27 17:00 UTC
CVE	2026-08-27 20:10 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

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

EPSS

11.1%

Weaknesses

Improper Authentication CWE-287

Timeline

From disclosure to observed exploitation

27 Aug 2026
KEV confirmed by CVE

Exploitation attested by an external source
27 Aug 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
21 Nov 2023
CVE published

Vulnerability disclosed publicly
21 Nov 2023
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2023-49105

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2023-49105",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.11074,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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