CVE-2026-9129 — Path Traversal in Altium Enterprise Server Viewer StorageController Allows Arbitrary File Read
A path traversal vulnerability exists in the Altium Enterprise Server Viewer StorageController due to improper handling of file path route parameters. On on-premise deployments that use local filesystem storage, a regular authenticated user can supply a URL-encoded absolute path (such as an encoded drive letter) in a Viewer storage API request, causing the configured storage root to be discarded and allowing arbitrary files to be read from the server filesystem. Because the readable files include the server's master configuration, which stores database credentials, signing key locations, certificate passwords, and OAuth secrets, exploitation can lead to disclosure of all server secrets and full compromise of the server and its data. Cloud deployments are not affected, as they use object storage and do not enable this component.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.3% (30-day exploitation probability)+4
- Technical severity (critical)+10
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Altium Altium Enterprise Server).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes matching the vulnerability class (file handling), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Altium | Altium Enterprise Server | < 8.0.4 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 9.4 | CVSS 4.0 | Critical | — | — | 4760f414-e1ae-4ff1-bdad-c7a9c3538b79 via NIST National Vulnerability Database |
| 9.4 | CVSS 4.0 | Critical | — | — | Altium via CVE Program (cve.org) e CISA ADP |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X (score shown at the top: 4760f414-e1ae-4ff1-bdad-c7a9c3538b79) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.33%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Monitor file creation in web directories and paths with traversal sequences (../).
Analysis and videos
CVE-2026-9129: Altium Enterprise Server Viewer StorageController Path Traversal Enables Arbitrary File Read
A path traversal flaw in the StorageController of the Altium Enterprise Server Viewer lets an authenticated user read arbitrary files on on-premise servers that use local filesystem storage. The record notes that the readable server master configuration holds database credentials, signing key locations and OAuth secrets, so exposure could extend to all server secrets. The record rates the issue critical with a CVSS 4.0 score of 9.4 and shows no confirmed exploitation in the sources consulted.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · altium/altium enterprise server
- SSVC assessment updated
- Record published
- CVSS changed · 9.4
- Source status changed · → Deferred
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
1 on the record
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-14439 Path Traversal in Altium Git Service Allows Remote Code Execution Jul 1, 2026
- High CVE-2026-11424 Server-Side Request Forgery in Altium Platform Design GraphQL Service Allows Information Disclosure Jun 5, 2026
- High CVE-2026-11431 Path Traversal in Altium Projects Service Allows Arbitrary File Read Jun 5, 2026
- Critical CVE-2026-11429 Path Traversal in Altium Vault ScriptsController Allows Unauthenticated Remote Code Execution Jun 5, 2026
- Critical CVE-2026-11423 Path Traversal in Altium Enterprise Server Collaboration Service Allows Privilege Escalation Jun 5, 2026
- Critical CVE-2026-11420 Path Traversal in Altium Enterprise Server NIS Allows Unauthenticated Arbitrary File Write and File Read Jun 5, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No fixed version, patch or mitigation documented.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-9129 is "Path Traversal in Altium Enterprise Server Viewer StorageController Allows Arbitrary File Read", rated Critical. It affects Altium Enterprise Server (Altium); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.4 describes technical severity. EPSS 0.33% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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