Yes. CISA added CVE-2023-49103 to its Known Exploited Vulnerabilities catalogue on 30 November 2023, which it does only when there is reliable evidence of active exploitation. CISA has not linked it to known ransomware campaigns. ownCloud graphapi contains an information disclosure vulnerability that can reveal sensitive data stored in phpinfo() via GetPhpInfo.php, including administrative credentials.
What “being exploited in the wild” means for this CVE
For a vulnerability like CVE-2023-49103, “in the wild” means the issue moved beyond lab proof-of-concept into real attacker use against exposed systems. The practical question is not whether exploitation is theoretically possible, but whether you should treat the flaw as active exposure and a live incident-response priority. CISA’s KEV listing is the clearest operational signal.
That changes the response threshold. Once a CVE is in KEV, teams should assume exploit scanning, opportunistic compromise attempts, and rapid follow-on abuse may already be happening somewhere in the environment. For an information disclosure flaw, the immediate concern is often not just the initial leak, but what the leaked data enables next, especially credential theft and reuse.
Authoritative tracking matters here. Use the CISA Known Exploited Vulnerabilities Catalog to confirm the exploitation status that drives priority, and use the CVE Program and NIST National Vulnerability Database for the canonical vulnerability record and technical context.
Why this disclosure bug is operationally dangerous
Information disclosure in a component like ownCloud graphapi can be dangerous even when the flaw is “just” reading data. If the application can expose phpinfo() content or other server-side details, the disclosure may include secrets, environment values, or administrative credentials that attackers can immediately repurpose. That makes the vulnerability a stepping stone to broader compromise rather than a one-off leak.
This kind of issue is especially sensitive in internet-facing collaboration platforms because the exposed data may support lateral movement, account takeover, or further application compromise. Even if the original bug does not execute code, it can still hand attackers the material they need to authenticate elsewhere, pivot into adjacent services, or harvest more sensitive configuration from the same stack.
For prioritisation, the question is not whether the bug has a high score in isolation. The question is whether the affected instance can reveal secrets, whether those secrets are still valid, and whether the exposed surface is reachable from the internet or from a less trusted network segment. The FIRST EPSS model can help prioritise exploitation likelihood, but KEV status should already push this into the urgent queue.
What to do when patching or mitigation cannot happen immediately
If you cannot remediate at once, reduce exposure around the vulnerable endpoint first. Restrict access to the affected ownCloud instance, remove unnecessary external reachability, and monitor for requests to the disclosed path or related discovery patterns. If logs show suspicious access before the fix lands, treat the event as possible compromise, not just vulnerability reconnaissance.
Because the issue can expose administrative or other sensitive credentials, response planning should include credential rotation and session review where exposure is plausible. The right question is not only “is the server patched?” but “did this flaw reveal anything that remains trusted today?” If yes, rotate what was exposed, invalidate sessions where appropriate, and review adjacent systems that accepted the same credentials.
For teams that need a structured response path, NHIMG’s Zero-Day and Exploited Vulnerabilities Guide and Vulnerability Management Guide are useful for KEV triage, emergency mitigation, and post-patch verification.
Risk and Threat Considerations
KEV inclusion means you should assume active adversary interest, even if you have not yet seen a confirmed alert in your own environment. For disclosure bugs, the main threat is often staged exploitation: attackers find the exposed endpoint, extract sensitive data, and then use that information to widen access or move into higher-value systems.
Failure mechanism: The application exposes server-side content or secrets that were never intended for remote users, and attackers convert that disclosure into credential reuse, privilege escalation, or follow-on compromise.
Impact: The organisation may face account takeover, unauthorized access to stored data, lateral movement into connected services, and a longer incident because the first sign of compromise may be a leak rather than an obvious breach.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST CSF 2.0 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-17 — Incident Response Management | KEV exploitation demands fast incident handling and validation of possible compromise. |
| Recommendation — Escalate the CVE into incident response and verify whether disclosure led to compromise. | ||
| NIST CSF 2.0 | RS.MA-01 — Log records are collected and analyzed | Active exploitation calls for log analysis to confirm access attempts and abuse. |
| PR.DS-01 — Data-at-rest data is protected | Information disclosure can expose stored sensitive data and secrets. | |
| Recommendation — Analyze logs for requests to the vulnerable path and indicators of follow-on abuse. Protect exposed sensitive data and rotate any secrets that could have been disclosed. | ||
| NIST SP 800-53 Rev 5 | RA-5 — Vulnerability Monitoring and Scanning | A KEV-listed CVE needs prioritised monitoring, exposure confirmation, and remediation tracking. |
| AU-6 — Audit Record Review, Analysis, and Reporting | Suspicious access to a disclosure path should be reviewed in logs and reported. | |
| Recommendation — Prioritize the vulnerable asset for remediation and verify exposure across the environment. Review audit records for exploitation attempts and report confirmed abuse promptly. | ||
Practitioner Guidance
What to verify: Confirm whether the vulnerable ownCloud graphapi path is reachable, whether the affected host has exposed phpinfo() or similar diagnostics, and whether any secrets disclosed by the flaw are still valid. If you cannot prove the leaked data was harmless, assume it had operational value.
Decision rule: If the instance was internet-facing or exposed to semi-trusted users, treat the problem as both vulnerability remediation and compromise assessment. Patch or mitigate first, then validate whether credential rotation, session invalidation, or broader secret hygiene is required.
What good looks like: The vulnerable endpoint is no longer reachable in production, related secrets have been rotated where needed, and monitoring can distinguish routine scanning from attempted exploitation of the same path.
Practitioner takeaway: With KEV-listed disclosure flaws, the decisive question is not whether the vulnerability is real, but whether it may already have turned your hidden data into attacker leverage.
Related resources from NHI Mgmt Group
- CVE-2023-49103 (ownCloud graphapi Information Disclosure)
- Is CVE-2023-21237 (Android Pixel Information Disclosure Vulnerability) being exploited in the wild?
- Is CVE-2023-21492 (Samsung Mobile Devices Insertion of Sensitive Information Into Log File) being exploited in the wild?
- Is CVE-2024-24919 (Check Point Quantum Security Gateways Information Disclosure) being exploited in the wild?