CVE-2025-27621Network attack vector

Cross-origin privileged access via default API key

Published Aug 17, 2026 · Updated Aug 17, 2026

Improper authentication in UpTrain 0.7.1 and earlier allows remote attackers to perform privileged API actions via cross-origin requests. The dashboard backend creates a default user named default_key, uses that fixed username as the accepted uptrain-access-token value in validate_api_key_public, and permits any origin through a wildcard CORS policy. Exposure requires network reachability to the backend and a request source that can set the header, such as a malicious website; published records for this CVE describe action as the default user rather than host-level code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in UpTrain 0.7.1 and earlier allows remote attackers to perform privileged API actions via cross-origin requests. The dashboard backend creates a default user named default_key, uses that fixed username as the accepted uptrain-access-token value in validate_api_key_public, and permits any origin through a wildcard CORS policy. Exposure requires network reachability to the backend and a request source that can set the header, such as a malicious website; published records for this CVE describe action as the default user rather than host-level code execution.

The record

CVE
CVE-2025-27621
Published
Aug 17, 2026
Updated
Aug 17, 2026
Vendor
UpTrain AI
Product
UpTrain
Classifications
CWE-287, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 17, 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=<= 0.7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

UpTrain AI · UpTrainversion=<= 0.7.1

Published CVSS scores

7.7vuln.mlab.shCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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