CVE-2026-11420
published 2026-06-05CVE-2026-11420: Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write…
PriorityP272critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.71%
48.8th percentile
Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write arbitrary files to any writable location on the server filesystem and to read package archive files from the server. No authentication, session, or credentials are required.
Because content-controlled files can be written to web-accessible directories, or used to overwrite application binaries or configuration files, exploitation can be escalated to remote code execution in the context of the service account, and can disclose deployment package contents. Altium 365 cloud deployments are not affected, as the Network Installation Service is not part of the cloud offering.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| altium | altium_enterprise_server | < 8.1.1 | 8.1.1 |
| altium | on-prem_enterprise_server | < 8.1.1 | 8.1.1 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.010.0CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
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VulDB
Altium Enterprise Server up to 8.1.0 Network Installation Service path traversal
vuldb·2026-06-06·CVSS 10.0
CVE-2026-11420 [CRITICAL] Altium Enterprise Server up to 8.1.0 Network Installation Service path traversal
A vulnerability was found in Altium Enterprise Server up to 8.1.0. It has been declared as critical. The affected element is an unknown function of the component Network Installation Service. Such manipulation leads to path traversal.
This vulnerability is referenced as CVE-2026-11420. It is possible to launch the attack remotely. No exploit is available.
It is recommended to upgrade the affected component.
GHSA
Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write arbitrary files to any writable location on
ghsa_unreviewed·2026-06-05
CVE-2026-11420 [CRITICAL] CWE-22 Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write arbitrary files to any writable location on
Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write arbitrary files to any writable location on the server filesystem and to read package archive files from the server. No authentication, session, or credentials are required.
Because content-controlled files can be written to web-accessible directories, or used to overwrite application binaries or configuration files, exploitation can be escalated to remote code execution in the context of the service account, and can disclose deployment package contents. Altium 365 cloud deployments are not affected, as the Network Installation Service is not part of the cloud offering.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-06-05
Published