CVE-2021-36403
MEDIUM
5.3
CVSS Score
Published: March 6, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 03:58 AM UTC
2 products affected across 2 vendorsMoodleMoodle
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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit
Description
In Moodle, in some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 3.9.83.10.0 ≤ v < 3.10.53.11.0 ≤ v < 3.11.1
Affected range stops below 3.10.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.11.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.9.8, so it looks safe — our inference, not a vendor statement
v ≤ 3.9.7
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
SSVC — Action Prioritization
SSVCNo known exploitAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.3MEDIUMCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-912NVD-CWE-noinfo
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