How severe is CVE-2023-30943?

CVE-2023-30943 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-30943?

CVE-2023-30943 affects the following packages: moodle/moodle (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2023-30943?

Update moodle/moodle to 4.2.0-rc2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-30943 is resolved across your whole dependency graph.

How do I detect CVE-2023-30943 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moodle/moodle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2023-30943 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2023-30943 actively exploited in the wild?

Yes. There are 4 known exploit references for CVE-2023-30943, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-30943?

CVE-2023-30943 has an EPSS (Exploit Prediction Scoring System) score of 6.8%, placing it in the 94th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2023-30943?

CVE-2023-30943 is classified as CWE-73 (CWE-73), CWE-610 (CWE-610). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Is there exploit tooling available for CVE-2023-30943?

A Nuclei detection template exists for CVE-2023-30943, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2023-30943 published, and has it been updated?

CVE-2023-30943 was published on May 2, 2023 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2023-30943 — moodle

MEDIUMFix: moodle/moodle@59d42e1

CVE-2023-30943 is a medium-severity (CVSS 6.5) CWE-73 vulnerability in moodle/moodle. 4 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for moodle/moodle — see the affected versions and patch details below.

Moodle: tinymce loaders susceptible to arbitrary folder creation

Also known asBIT-moodle-2023-30943GHSA-22gj-8qj2-fj46

Published

May 2, 2023

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

4 known

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

6.8%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs94th percentile — riskier than 94% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐘moodle/moodle

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

The vulnerability was found Moodle which exists because the application allows a user to control path of the older to create in TinyMCE loaders. A remote user can send a specially crafted HTTP request and create arbitrary folders on the system.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`moodle/moodle`	all versions	4.2.0-rc2`composer require moodle/moodle:^4.2.0-rc2`

Affected Products

3 products · 5 configurations

Application

extra packages for enterprise linuxfedoraproject

1 version

7.0

fedorafedoraproject

3 versions

363738

Application

moodlemoodle

≥ 4.1.0 && < 4.1.3

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The vulnerability was found Moodle which exists because the application …

github.comGithubAug 2023

Report on github.com

github.comGithubSep 2023

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moodle/moodle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update moodle/moodle to 4.2.0-rc2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-30943 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How to detect CVE-2023-30943

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2023-30943 -u https://target

Template: Moodle - Cross-Site Scripting/Remote Code Execution
Severity: medium
Impact: Successful exploitation of these vulnerabilities could lead to unauthorized access, data theft, and potential compromise of the Moodle application and its users.
Remediation: Apply the latest security patches and updates from the vendor to address this vulnerability.

Template by ProjectDiscovery nuclei-templates (ritikchaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2023-30943 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works