CVE-2025-5320Public exploitNetwork attack vector

Unauthorized cross-origin requests via localhost alias bypass

Published May 29, 2025 · Updated Jun 1, 2025

CORS origin validation errors in Gradio 5.29.0 through 5.29.1 allow remote attackers to send unauthorized cross-origin requests. The is_valid_origin function treats any Host value absent from localhost_aliases as public and then accepts every Origin without validation. Exploitation requires a locally deployed app reached through an unlisted alias, such as an IPv6-mapped loopback address or a public domain resolving to loopback, and permits unauthorized API actions.

CVSS severity6.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CORS origin validation errors in Gradio 5.29.0 through 5.29.1 allow remote attackers to send unauthorized cross-origin requests. The is_valid_origin function treats any Host value absent from localhost_aliases as public and then accepts every Origin without validation. Exploitation requires a locally deployed app reached through an unlisted alias, such as an IPv6-mapped loopback address or a public domain resolving to loopback, and permits unauthorized API actions.

The record

CVE
CVE-2025-5320
Published
May 29, 2025
Updated
Jun 1, 2025
Vendor
Gradio
Product
Gradio
Classifications
CWE-345, CWE-346, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2025Record 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=5.29.0
  2. Affected versionversion=5.29.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gradio · Gradioversion=5.29.0; version=5.29.1

Published CVSS scores

6.3VulDB CNACVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/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
2.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
2.6VulDB CNAAV:N/AC:H/Au:N/C:N/I:P/A:N
3.7VulDB CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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 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 exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-346Origin Validation Error
T1190Exploit Public-Facing Application

Public exploit references

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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