CVE-2023-40515: LG Simple Editor joinAddUser Improper Input Validation Denial-of-Service Vulnerability

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2023-40515 is a high-severity flaw (CVSS 7.5) affecting simple editor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LG Simple Editor joinAddUser Improper Input Validation Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of LG Simple Editor. Authentication is not required to exploit this vulnerability. The specific flaw exists within the joinAddUser method. The issue results from improper input validation. An attacker can leverage this vulnerability to create a denial-

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-20
Published	2024-05-03
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: lg

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-05-03 03:15 UTCPublished CVE record published
2026-06-17 06:18 UTCUpdated Record last modified

lg simple editor DOWNGRADE

Affected: 3.21.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.21.0

1. Check installed version

apt-cache policy simple-editor || rpm -q simple-editor || simple-editor --version

2. No fixed release: DOWNGRADE to a release before 3.21.0 (Debian / Ubuntu)

apt-cache madison simple-editor sudo apt install simple-editor=<VERSION_BEFORE_3.21.0> sudo apt-mark hold simple-editor

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simple-editor sudo dnf downgrade simple-editor-<VERSION_BEFORE_3.21.0> sudo dnf versionlock add simple-editor

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-40515?

simple editor: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-40515 being exploited?

CVE-2023-40515 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-40515 affect?

CVE-2023-40515 affects simple editor. Severity is high (CVSS 7.5). LG Simple Editor joinAddUser Improper Input Validation Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of LG Simple Editor. Authentication is not

How urgent is CVE-2023-40515?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-40516 HIGH 7.8 DOWNGRADE LG Simple Editor Incorrect Permission Assignment Local Privilege Escalation Vulnerability
CVE-2023-40514 MEDIUM 6.5 DOWNGRADE LG Simple Editor FileManagerController getImageByFilename Directory Traversal Information Disclosure Vulnerabi
CVE-2023-40513 MEDIUM 6.5 DOWNGRADE LG Simple Editor UserManageController getImageByFilename Directory Traversal Information Disclosure Vulnerabil
CVE-2023-40512 MEDIUM 6.5 DOWNGRADE LG Simple Editor PlayerController getImageByFilename Directory Traversal Information Disclosure Vulnerability
CVE-2023-40511 HIGH 7.5 DOWNGRADE LG Simple Editor checkServer Authentication Bypass Vulnerability

References

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