CVE-2023-41893Network attack vector

Access token theft via unvalidated redirect URI

Published Oct 19, 2023 · Updated Sep 12, 2024

Information exposure in Home Assistant Core before 2023.9.0 allows remote attackers to steal access tokens through a crafted login link. The login flow accepts attacker-controlled redirect_uri and client_id values, then sends the post-authentication authorization code to the supplied URL. A victim must follow the link and authenticate, and the Home Assistant instance must be Internet-accessible for the stolen token to be used remotely.

CVSS severity4.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Home Assistant Core before 2023.9.0 allows remote attackers to steal access tokens through a crafted login link. The login flow accepts attacker-controlled redirect_uri and client_id values, then sends the post-authentication authorization code to the supplied URL. A victim must follow the link and authenticate, and the Home Assistant instance must be Internet-accessible for the stolen token to be used remotely.

The record

CVE
CVE-2023-41893
Published
Oct 19, 2023
Updated
Sep 12, 2024
Vendor
Home Assistant
Product
Home Assistant Core
Classifications
CWE-200, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2024Record 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=< 2023.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant Coreversion=< 2023.9.0

Published CVSS scores

4.3GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
5.1GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.

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-200Exposure of Sensitive Information to an Unauthorized Actor
T1528Steal Application Access Token

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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