How severe is CVE-2025-3643?

CVE-2025-3643 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-3643 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-3643?

CVE-2025-3643 affects Moodle. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-3643?

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

Does CVE-2025-3643 have an EU (EUVD) identifier?

Yes. CVE-2025-3643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12518.

When was CVE-2025-3643 published?

CVE-2025-3643 was published on 2025-04-25 and last updated on 2026-06-17.

CVE-2025-3643

CVE-2025-3643 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12518
Weakness: CWE-79
Affected product: Moodle
Published: 2025-04-25
Last modified: 2026-06-17

Description

A flaw was found in Moodle. The return URL in the policy tool required additional sanitizing to prevent a reflected Cross-site scripting (XSS) risk.

Frequently asked questions

What is CVE-2025-3643?: A flaw was found in Moodle. The return URL in the policy tool required additional sanitizing to prevent a reflected Cross-site scripting (XSS) risk.
How severe is CVE-2025-3643?: CVE-2025-3643 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-3643 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-3643?: CVE-2025-3643 affects Moodle. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-3643?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-3643 have an EU (EUVD) identifier?: Yes. CVE-2025-3643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12518.
When was CVE-2025-3643 published?: CVE-2025-3643 was published on 2025-04-25 and last updated on 2026-06-17.

References

Affected products (1)

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

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