CVE-2023-49103: ownCloud graphapi Information Disclosure Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Yes, if you run ownCloud ownCloud graphapi. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2023-11-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2023-12-21; treat that as the outer limit, not the target.
• EPSS 78.4%, percentile 99.6: FIRST’s model estimates a 78.4% chance of exploitation activity in the next 30 days, higher than 99.6% of all scored CVEs (very high). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

What it is

An issue was discovered in ownCloud owncloud/graphapi 0.2.x before 0.2.1 and 0.3.x before 0.3.1. The graphapi app relies on a third-party GetPhpInfo.php library that provides a URL. When this URL is accessed, it reveals the configuration details of the PHP environment (phpinfo). This information includes all the environment variables of the webserver. In containerized deployments, these environment variables may include sensitive data such as the ownCloud admin password, mail server credentials, and license key. Simply disabling the graphapi app does not eliminate the vulnerability. Additionally, phpinfo exposes various other potentially sensitive configuration details that could be exploited by an attacker to gather information about the system. Therefore, even if ownCloud is not running in a containerized environment, this vulnerability should still be a cause for concern. Note that Docker containers from before February 2023 are not vulnerable to the credential disclosure.

CISA’s summary

ownCloud graphapi contains an information disclosure vulnerability that can reveal sensitive data stored in phpinfo() via GetPhpInfo.php, including administrative credentials.

Weakness type: CWE-200.

Product: ownCloud ownCloud graphapi · Assigned by: mitre · Published: 2023-11-21

Affected and fixed versions

Severity scores

• Attack complexity: low
• Attack vector: network (remotely reachable)
• Privileges required: none (no login)
• Scope: changed (can affect other components)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: added 2023-11-30; federal due date 2023-12-21. Known ransomware use: Unknown.
• CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
• CISA SSVC assessment: exploitation active, automatable yes, technical impact partial.
• FIRST EPSS (model of 2026-10-21): 78.43% probability of exploitation activity in the next 30 days; percentile 99.6.

Timeline

• 2023-11-21 — CVE record published by mitre
• 2023-11-30 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2023-12-21 — CISA remediation deadline for US federal agencies
• 2025-10-21 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. Listed in CISA KEV notes (owncloud.com) owncloud.com

Vulnerability records

1. CVE.org record CVE-2023-49103 cve.org
2. NVD entry CVE-2023-49103 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

1. owncloud.org owncloud.org

All exploited ownCloud vulnerabilities · Today’s Security Digest