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CVE-2023-49103

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in ownCloud graphapi. For every flaw being used in attacks, see Exploited flaws.

CVE-2023-49103 is a security flaw in ownCloud graphapi. Attackers can read information from ownCloud graphapi that should be private. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 30 Nov 2023.[1]

ownCloud graphapi is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. ownCloud has published a fix or advice.

Description

CISA calls it a graphapi information disclosure in ownCloud ownCloud graphapi. In its words: “ownCloud graphapi contains an information disclosure vulnerability that can reveal sensitive data stored in phpinfo() via GetPhpInfo.php, including administrative credentials.”[1]

The CVE record adds: “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…”[2]

The underlying weakness is information exposure (CWE-200), in MITRE’s list of common software weaknesses.

It scores 7.5 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; ownCloud’s advisory has them[3]. CISA names the product as ownCloud ownCloud graphapi.

Most families won’t have ownCloud graphapi; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 30 Nov 2023, 9 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 21 Dec 2023 to fix it.[1]

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 78%. That’s in the top 1% of the flaws it scores.[4]

CISA assesses it as automatable: attackers can run it against many targets at once.

CISA doesn’t say who was attacked, or how.

Fix

ownCloud has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.”[1]

  1. Check whether you use it.ownCloud graphapi is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 21 Dec 2023 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 7.5.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 78%.[4]

See also

Other ownCloud flaws

Other information exposure flaws

  • CVE-2025-68686, Fortinet FortiOS: exposure of sensitive information to an unauthorized actor ·
  • CVE-2026-20133, Cisco Catalyst SD-WAN Manager: exposure of sensitive information to an unauthorized actor ·
  • CVE-2025-31125, Vitejs: improper access control ·
  • CVE-2026-20805, Microsoft Windows: information disclosure ·
  • CVE-2021-41277, Metabase: geoJSON API local file inclusion ·

Added the same day

  • CVE-2023-6345, Chrome and other Chromium browsers: skia integer overflow ·

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “ownCloud graphapi Information Disclosure Vulnerability”. Known Exploited Vulnerabilities Catalog, added 30 Nov 2023.
  2. ^ National Institute of Standards and Technology. “CVE-2023-49103 Detail”. National Vulnerability Database, published 21 Nov 2023.
  3. ^ ownCloud. Advisories and fixes: owncloud.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.778, percentile 99.6, 31 Oct 2026.
  5. CVE Program. “CVE-2023-49103”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.