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CVE Record

CVE-2021-36568: In certain Moodle products after creating a course, it is possible to add in a arbitrary "Topic" a resource...

In certain Moodle products after creating a course, it is possible to add in a arbitrary "Topic" a resource, in this case a "Database" with the type "Text" where its values "Field name" and "Field description" are vulnerable to Cross Site Scripting Stored(XSS). This affects Moodle 3.11 and Moodle 3.10.4 and Moodle 3.9.7.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-36568 is a stored cross-site scripting issue in certain Moodle versions. A user able to create course content could place malicious script in database field metadata, affecting other users who later view it. The source bundle does not provide a CVSS score or confirmed active exploitation.

Executive priority

Treat as a medium-priority remediation unless your Moodle instance allows many users to create course resources. The main business concern is persistent script execution against students, staff, or administrators who view affected course content.

Technical view

The CVE describes stored XSS in Moodle Database activity fields of type Text, specifically Field name and Field description, after adding a Database resource under a course topic. The description names Moodle 3.11, 3.10.4, and 3.9.7 as affected. Source metadata lacks CWE, CVSS, and detailed fixed-version information.

Likely exposure

Exposure is most likely on Moodle sites running the named versions where teachers, course creators, or similar roles can create Database resources and define Text fields. Public or broadly delegated course-authoring permissions increase business risk.

Exploitation context

The bundle does not show KEV listing or other evidence of active exploitation. The risk is persistent content execution against viewers, but the described path appears to require authenticated content-authoring capability inside Moodle.

Researcher notes

Affected-version evidence comes from the CVE description, while detailed product metadata is incomplete. Fedora advisories are listed, but the supplied bundle does not include exact fixed Moodle versions, CVSS metrics, or proof of exploitation.

Mitigation direction

  • Identify Moodle instances running 3.11, 3.10.4, or 3.9.7.
  • Apply vendor or distribution updates referenced by Moodle or Fedora guidance.
  • Restrict course and Database activity creation to trusted roles.
  • Review existing Database Text fields for suspicious names or descriptions.
  • Check vendor advisories for exact fixed versions before change windows.

Validation and detection

  • Inventory Moodle versions across production and non-production environments.
  • Confirm who can create courses, topics, and Database resources.
  • Review affected field metadata for untrusted script-like content.
  • Verify patched or updated packages are installed after remediation.
  • Test that field names and descriptions are safely rendered.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Database behavior lookup

The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-36568 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.