CVE-2026-40050
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedCrowdStrike has released security updates to address a critical unauthenticated path traversal vulnerability (CVE-2026-40050) in LogScale. This vulnerability only requires mitigation by customers that host specific versions of LogScale and does not affect Next-Gen SIEM customers. The vulnerability exists in a specific cluster API endpoint that, if exposed, allows a remote attacker to read arbitrary files from the server filesystem without authentication. Next-Gen SIEM customers are not affected and do not need to take any action. CrowdStrike mitigated the vulnerability for LogScale SaaS customers by deploying network-layer blocks to all clusters on April 7, 2026. We have proactively reviewed all log data and there is no evidence of exploitation. LogScale Self-hosted customers should upgrade to a patched version immediately to remediate the vulnerability. CrowdStrike identified this vulnerability during continuous and ongoing product testing.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA critical unauthenticated path traversal vulnerability (CVSS 9.8) exists in specific LogScale cluster API endpoints. When exposed, this flaw allows remote attackers to read arbitrary files from the server filesystem without any authentication, potentially exposing sensitive system data.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Locate LogScale installation and versionIdentify the LogScale installation directory and determine the installed version by checking version files, about pages, or running 'docker ps' if containerized. Common locations include /opt/humio or check the running service version.Affected if Running a self-hosted LogScale version that is older than the patched version released after April 2026
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Verify cluster API is enabledCheck LogScale configuration files (such as humio-config.yaml or similar) for the presence and configuration of cluster API settings. Look for directives related to cluster API endpoints or the cluster controller.Affected if The cluster API functionality is enabled in the LogScale configuration
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Assess network exposure of cluster APIReview firewall rules, reverse proxy configurations, and LogScale network bindings to determine if the cluster API ports (typically ports 8080, 8081, or custom configured ports) are accessible from untrusted networks or the public internet.Affected if The cluster API endpoints are exposed to untrusted network segments or the internet without authentication controls
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Check for unauthorized file access attemptsReview LogScale audit logs and system access logs for unusual path traversal patterns such as '../' sequences or access to sensitive system files like /etc/passwd, /etc/shadow, or configuration directories.Affected if Logs show suspicious path traversal requests targeting the cluster API endpoints
You are affected if you run a self-hosted LogScale installation with the cluster API enabled and exposed to untrusted networks, and your version predates the patched release.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataSelf-hosted LogScale customers must upgrade to the patched version immediately. SaaS customers are already protected via network-layer blocks deployed on April 7, 2026. Next-Gen SIEM customers are unaffected.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-40050 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-40050 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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