CVE-2026-45773Network attack vector

CLI credential replacement via unvalidated callback state

Published May 15, 2026 · Updated May 15, 2026

CSRF in Vercel Turborepo before 2.9.14 allows remote attackers to replace self-hosted CLI login credentials through a local callback. The login and SSO callback accepts an attacker-supplied token without requiring a matching state value, so the first callback wins. Exploitation requires a user to start browser-based authentication against a self-hosted endpoint and load malicious web content before the legitimate callback arrives.

CVSS severity5.1
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in Vercel Turborepo before 2.9.14 allows remote attackers to replace self-hosted CLI login credentials through a local callback. The login and SSO callback accepts an attacker-supplied token without requiring a matching state value, so the first callback wins. Exploitation requires a user to start browser-based authentication against a self-hosted endpoint and load malicious web content before the legitimate callback arrives.

The record

CVE
CVE-2026-45773
Published
May 15, 2026
Updated
May 15, 2026
Vendor
Vercel
Product
Turborepo
Classifications
CWE-352, CWE-384
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2026CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.9.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vercel · Turborepoversion=< 2.9.14

Published CVSS scores

5.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CWE-384Session Fixation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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