CVE-2023-26245

Custom firmware installation via modifiable AppUpgrade

Published Apr 27, 2023 · Updated Jan 31, 2025

Incorrect authorization in Hyundai Gen5W_L AE_E_PE_EUR.S5W_L001.001.211214 allows local users to install custom firmware. The firmware installer trusts a modifiable AppUpgrade binary to perform the version check, letting altered code approve newer, older, or customized images. Low-privilege local access to modify AppUpgrade is required, and successful exploitation replaces the IVI software image with attacker-controlled firmware.

CVSS severity7.8
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Hyundai Gen5W_L AE_E_PE_EUR.S5W_L001.001.211214 allows local users to install custom firmware. The firmware installer trusts a modifiable AppUpgrade binary to perform the version check, letting altered code approve newer, older, or customized images. Low-privilege local access to modify AppUpgrade is required, and successful exploitation replaces the IVI software image with attacker-controlled firmware.

The record

CVE
CVE-2023-26245
Published
Apr 27, 2023
Updated
Jan 31, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863, T1601.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1601.001Patch System Image

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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