CVE-2026-5320Network attack vector

Unauthenticated Chat API access

Published Apr 2, 2026 · Updated Apr 2, 2026

Missing authentication in Vanna 2.0.0 through 2.0.2 allows remote attackers to access the Chat API through /api/vanna/v2/. The CNA identifies an unknown function in the Chat API endpoint but does not disclose which request handler omits authentication or how identity checks are bypassed. No credentials or user interaction are required; the confirmed consequence is unauthorized use of the reachable chat API, while endpoint-specific effects remain undisclosed.

CVSS severity7.3
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Vanna 2.0.0 through 2.0.2 allows remote attackers to access the Chat API through /api/vanna/v2/. The CNA identifies an unknown function in the Chat API endpoint but does not disclose which request handler omits authentication or how identity checks are bypassed. No credentials or user interaction are required; the confirmed consequence is unauthorized use of the reachable chat API, while endpoint-specific effects remain undisclosed.

The record

CVE
CVE-2026-5320
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Vanna AI
Product
Vanna
Classifications
CWE-306, CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=2.0.0
  2. Affected versionversion=2.0.1
  3. Affected versionversion=2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vanna AI · Vannaversion=2.0.0; version=2.0.1; version=2.0.2

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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-306Missing Authentication for Critical Function
CWE-287Improper Authentication
T1190Exploit Public-Facing Application

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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