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Hackers target exposed Vite dev servers to steal AWS, Azure secrets

Recorded: Sept. 14, 2026, 5 p.m.

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Hackers target exposed Vite dev servers to steal AWS, Azure secrets

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HomeNewsSecurityHackers target exposed Vite dev servers to steal AWS, Azure secrets

Hackers target exposed Vite dev servers to steal AWS, Azure secrets

By Bill Toulas

September 14, 2026
12:15 PM
0

A mass-scanning campaign targeting internet-exposed Vite development servers is attempting to steal cloud credentials and configurations from AWS and Azure deployments.
The operation leverages an exploit for CVE-2026-39364, a high-severity vulnerability that allows bypassing file read/access controls in Vite versions 7.1.0 through 7.3.2, as well as the 8.x branch before 8.0.5.
The flaw was disclosed on April 7 and allows an unauthenticated attacker to manipulate query parameters in an HTTP GET request to bypass security restrictions and retrieve files in plaintext from locations that should normally be out of their reach.
Technology company F5 detected the attacks through its honeypot sensors, observing more than 800 attacks and approximately 32,000 raw events over a month.
“When specific parameters such as ?raw, ?import&raw, or ?import&url&inline are appended to a request, the server fails to enforce deny-list filtering and serves the target file with an HTTP 200 response,” F5 explains.
After breaching a system, the scanning focused on valuable secrets by using extensive wordlists for the following types of data:
.env, .env.production, .env.local, and other environment files
AWS credential files from several possible home directories
AWS configuration files and credential backups
Azure credentials and access tokens
Terraform state and variable files
Serverless configuration/state
/proc/self/environ, /proc/1/environ, and /proc/self/cwd/.env
/etc/passwd
F5 notes that the operation also tried traversal and encoding variants, including double-encoded traversal sequences, apparently to get past reverse proxies or WAF normalization.
Most of the observed malicious activity originated from the United States, Belgium, and the Netherlands, with the attackers using Google Cloud IP ranges for evasion.
The most active IP addresses also leveraged other access control flaws in Vite: CVE-2025-30208, CVE-2025-31125 (flagged as actively exploited), and CVE-2024-45811.
How to protect Vite
Although Vite normally binds to localhost, F5 researchers say that developers often expose it online through passing the --host flag, setting the server.host, or misconfigured Docker port mappings.
The technology company recommends updating Vite servers to the latest version, which addresses the exploited flaws. Developers should also block access through port 5173, block suspicious /@fs/ requests, and avoid trusting crawler User-Agent strings.
The top sources for the malicious attempts are 34.14.15[.]105, 34.16.200[.]129, and 34.11.196[.]206, which should be blocklisted.
If unpatched Vite servers were publicly exposed, it is recommended to rotate all secrets in the reach of the vulnerable system.

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Actively Exploited
AWS
Cloud
Secret Scanning
Vite

Bill Toulas
Bill Toulas is a tech writer and infosec news reporter with over a decade of experience working on various online publications, covering open-source, Linux, malware, data breach incidents, and hacks.

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A mass scanning campaign was identified targeting internet-exposed Vite development servers with the objective of exfiltrating cloud credentials and configurations from Amazon Web Services and Azure deployments. This operation exploited a high-severity vulnerability, CVE-2026-39364, which permits an unauthenticated attacker to bypass file read and access controls within specific versions of Vite, including versions 7.1.0 through 7.3.2, and the 8.x branch prior to 8.0.5. The flaw allows attackers to manipulate query parameters in HTTP GET requests to retrieve files in plaintext from unauthorized locations.

Technology company F5 detected this malicious activity through its honeypot sensors, registering over 800 attacks and approximately 32,000 raw events over a single month. Following the initial breach, the scanning activities focused on identifying valuable secrets by employing extensive wordlists against various sensitive file types. These targets included environment files such as .env, .env.production, and .env.local, AWS credential files located in various home directories, AWS configuration and credential backups, Azure credentials and access tokens, Terraform state and variable files, serverless configuration and state data, and system environment variables like /proc/self/environ and /proc/1/environ. The attackers also attempted to access basic system files like /etc/passwd.

The malicious attempts demonstrated sophisticated evasion techniques, involving traversal and various encoding variants, including double-encoded traversal sequences, presumably to circumvent reverse proxies or Web Application Firewalls through normalization processes. The majority of the observed malicious traffic originated from the United States, Belgium, and the Netherlands, with the attackers utilizing Google Cloud IP ranges to mask their origin. Furthermore, the malicious actors leveraged other existing access control weaknesses in Vite, including CVE-2025-30208, CVE-2025-31125, and CVE-2024-45811, amplifying their ability to compromise systems.

To mitigate this risk, the technology company recommends that developers update their Vite servers to the most current versions to patch the exploited flaws. Security best practices also advise developers to restrict network access by blocking traffic to port 5173, implement restrictions on suspicious requests to paths like /@fs/, and refrain from trusting information contained within User-Agent strings. If Vite servers were publicly exposed and vulnerable, it is strongly recommended that all secrets residing on those systems be immediately rotated. The report indicates that the most active malicious IP addresses used in these attempts include 34.14.15.105, 34.16.200.129, and 34.11.196.206, and these addresses should be added to blocklists.