CVE-2026-52656Public exploitNetwork attack vector

Unauthenticated code execution via firmware upload

Published Jul 20, 2026 · Updated Jul 20, 2026

Code injection in SJCAM SJ4000-Air 1.4C and earlier allows remote attackers to execute arbitrary code via a crafted FEX file. The unauthenticated HTTP update endpoint writes arbitrary uploads to the SD card, and the OTA flow installs a file named full_img.fex as firmware. The camera hotspot must be active and reachable; successful exploitation replaces the running firmware and grants full control of the device.

CVSS severity9.8
Critical
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Code injection in SJCAM SJ4000-Air 1.4C and earlier allows remote attackers to execute arbitrary code via a crafted FEX file. The unauthenticated HTTP update endpoint writes arbitrary uploads to the SD card, and the OTA flow installs a file named full_img.fex as firmware. The camera hotspot must be active and reachable; successful exploitation replaces the running firmware and grants full control of the device.

The record

CVE
CVE-2026-52656
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1601.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8Rapid7CVSS:3.1/AV:N/AC:L/PR:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code
T1601.001Patch System Image

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo