CVE-2023-40209Network attack vector

Authenticated data modification via unchecked AJAX handlers

Published Jun 12, 2024 · Updated Apr 28, 2026

Missing authorization in Highcompress Image Compressor 6.0.0 and earlier allows remote authenticated users to modify plugin data. The verify_highcompress_process_auto, verify_highcompress_process_images, and verify_highcompress_api_key AJAX handlers perform sensitive actions without capability checks. Subscriber-level access is sufficient to compress images and verify or modify the plugin API key.

CVSS severity6.5
Medium
EPSS probability0.32%
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

Missing authorization in Highcompress Image Compressor 6.0.0 and earlier allows remote authenticated users to modify plugin data. The verify_highcompress_process_auto, verify_highcompress_process_images, and verify_highcompress_api_key AJAX handlers perform sensitive actions without capability checks. Subscriber-level access is sufficient to compress images and verify or modify the plugin API key.

The record

CVE
CVE-2023-40209
Published
Jun 12, 2024
Updated
Apr 28, 2026
Vendor
Himalaya Saxena
Product
Highcompress Image Compressor
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=6.0.0
  2. Affected versionversion=n/a <=6.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Himalaya Saxena · Highcompress Image Compressorversion=0 <=6.0.0; version=n/a <=6.0.0

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

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

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