Is CVE-2018-7600 (Drupal Core Remote Code Execution) being exploited in the wild?

By NHI Mgmt Group Editorial Team Updated October 19, 2026 Domain: Threats, Abuse & Incident Response

Yes. CISA added CVE-2018-7600 to its Known Exploited Vulnerabilities catalogue on 3 November 2021, which it does only when there is reliable evidence of active exploitation. CISA lists it as known to be used in ransomware campaigns. Drupal Core contains a remote code execution vulnerability that could allow an attacker to exploit multiple attack vectors on a Drupal site, resulting in complete site compromise.

How to judge whether CVE-2018-7600 is being actively exploited

For a question like this, the key signal is not the vulnerability name alone but the exploitation status. CISA’s KEV inclusion is the practical indicator that the issue is being used in the wild, so the first step is to treat the Drupal Core flaw as an active threat condition, not a theoretical one. That changes urgency, prioritisation, and the need for exposure checks.

Use the KEV listing, vendor guidance, and your own web logs together. If a Drupal site is reachable from the internet, has not been verified against the vendor advisory, or shows unusual request patterns, assume it may have been probed already. That is especially true for public-facing content management systems where attackers often automate discovery and follow-on exploitation at scale.

A useful operational rule is to separate “published exploit” from “confirmed exploitation.” The former raises concern; the latter requires immediate response because the system may already have been altered, backdoored, or used to stage further activity. For this class of flaw, the question is not only whether exploit code exists, but whether your own instance has been exposed long enough to be targeted.

See the Zero-Day and Exploited Vulnerabilities Guide for a practical way to triage KEV-listed issues, and review the CISA Known Exploited Vulnerabilities Catalog for the authoritative exploitation status.

What to do if your Drupal instance may be exposed

Confirm whether the affected Drupal Core code is deployed anywhere in your estate, including internet-facing test, legacy, and forgotten instances. The fastest path to failure is assuming only production matters. For exploited web application flaws, forgotten lower-environment systems are often the easiest entry point and can still lead to credential theft, defacement, or lateral movement.

If exposure exists, apply the vendor fix or sanctioned mitigation immediately and then verify the site from the outside again. For a remotely exploitable web flaw, remediation is not complete until you know the vulnerable path is no longer reachable, the application starts cleanly, and no unexpected files, modules, or admin accounts appeared during the exposure window.

Where patching must wait, place compensating controls around the application, not just the host. Tighten edge filtering, restrict administrative access, reduce unnecessary public routes, and increase logging on authentication, file changes, and outbound connections. This does not make the flaw safe, but it can narrow the blast radius while you work the permanent fix.

Use the NIST National Vulnerability Database and the CVE Program to anchor internal tracking to the canonical vulnerability record, then map remediation ownership to the hosting team and application owner.

What signs suggest prior compromise after exploitation

For an RCE flaw in a public web application, post-exploitation checks matter as much as patching. Look for unexpected PHP files, altered templates, new admin users, unfamiliar cron jobs, and outbound traffic that does not fit the site’s normal behaviour. Attackers commonly follow initial code execution with persistence, credential harvesting, and further movement.

Review web server, application, and authentication logs for suspicious bursts of requests, unusual POST activity, and requests to admin or upload paths that do not match normal user behaviour. If the site handled sensitive sessions or stored privileged credentials, rotate the relevant secrets and invalidate sessions after you patch, because exploitation may have exposed more than the application itself.

Do not limit the review to the Drupal codebase. A remote code execution issue can be used to touch the wider host, scheduled tasks, connected databases, and any integration keys the application can reach. If compromise indicators are present, preserve evidence before full cleanup so you can scope the intrusion correctly.

Cross-check the response with the Vulnerability Management Guide for triage and verification discipline, and use the FIRST EPSS when you need to compare likelihood across a broader remediation queue.

Risk and Threat Considerations

Once a Drupal RCE is being actively exploited, the risk is no longer limited to service disruption. Attackers can use the initial code execution to establish persistence, steal credentials, modify content, and pivot into adjacent systems that trust the web server or the application owner.

Failure mechanism: The vulnerable site accepts crafted input that reaches code execution, which lets an attacker run commands or inject files through a remotely reachable attack path. If the instance is internet-facing, automated scanning can turn a single exposed system into a high-probability compromise candidate.

Impact: The result can be complete site compromise, defacement, malware placement, credential theft, or use of the server as a foothold for broader network access. If the application has privileged integrations, the impact can extend beyond the web tier into connected systems and shared accounts.

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-7 — Continuous Vulnerability Management	Active exploitation makes timely identification and remediation central to this CVE.
Recommendation — Prioritise this KEV-listed flaw for immediate remediation and exposure verification.
NIST CSF 2.0	RS.MA-01 — Response Planning and Execution	A known exploited RCE requires coordinated containment, eradication, and recovery actions.
Recommendation — Execute the incident response process for suspected exploitation and verify cleanup before restoring trust.
NIST SP 800-53 Rev 5	SI-2 — Flaw Remediation	This CVE is an actively exploited software flaw that requires remediation and verification.
	AU-6 — Audit Record Review, Analysis, and Reporting	Post-exploitation review depends on log analysis for suspicious requests and follow-on activity.
Recommendation — Remediate the flaw promptly and confirm the vulnerable code path is no longer reachable. Review application and web logs for indicators of exploitation and persistence.

Practitioner Guidance

What to prioritise: Treat KEV inclusion as a patch-now event, then verify exposure and compromise in the same workstream. For internet-facing CMS instances, the speed of containment matters more than waiting for perfect attribution of attacker activity.

What to verify: Confirm the exact Drupal deployment, check for unauthorized file changes and new accounts, and validate that sessions, API keys, and privileged credentials reachable from the app have been rotated where exposure is plausible.

Practitioner takeaway: For actively exploited web RCEs, the right question is not “was this ever dangerous?” but “is any reachable instance still exposing the attack path or evidence of compromise right now?”

Deepen Your Knowledge

Free weekly newsletter

Subscribe to the NHI & AI Identity Journal

The latest on NHI and Agentic AI security – articles, research, breaches, news and events every week.

Bonus 33% off our NHI Course when you subscribe.

NHIMG Editorial Note
Reviewed and updated by the NHIMG editorial team on October 19, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org