How severe is CVE-2024-28593?

CVE-2024-28593 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2024-28593 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-28593?

CVE-2024-28593 affects Moodle. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-28593?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-28593 have an EU (EUVD) identifier?

Yes. CVE-2024-28593 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0912.

When was CVE-2024-28593 published?

CVE-2024-28593 was published on 2024-03-22 and last updated on 2026-06-17.

CVE-2024-28593

CVE-2024-28593 is a medium-severity vulnerability in Moodle with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0912
Weakness: CWE-94
Affected product: Moodle
Published: 2024-03-22
Last modified: 2026-06-17

Description

The Chat activity in Moodle 4.3.3 allows students to insert a potentially unwanted HTML A element or IMG element, or HTML content that leads to a performance degradation. NOTE: the vendor's Using_Chat page says "If you know some HTML code, you can use it in your text to do things like insert images, play sounds or create different coloured and sized text." This page also says "Chat is due to be removed from standard Moodle."

Frequently asked questions

What is CVE-2024-28593?: The Chat activity in Moodle 4.3.3 allows students to insert a potentially unwanted HTML A element or IMG element, or HTML content that leads to a performance degradation. NOTE: the vendor's Using_Chat page says "If you know some HTML code, you can use it in your text to do things like insert images, play sounds or create different coloured and sized text." This page also says "Chat is due to be removed from standard Moodle."
How severe is CVE-2024-28593?: CVE-2024-28593 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2024-28593 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-28593?: CVE-2024-28593 affects Moodle. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-28593?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-28593 have an EU (EUVD) identifier?: Yes. CVE-2024-28593 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0912.
When was CVE-2024-28593 published?: CVE-2024-28593 was published on 2024-03-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:moodle:moodle:4.3.3:*:*:*:*:*:*:*

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