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Vulnerability record · public intelligence
CVE-2021-43821
CRITICAL

Files Accessible to External Parties in Opencast

Published Dec 14, 2021 · Updated Nov 3, 2026

Severity · CVSSCRITICAL · Not scored
Known exploitationNot listed
EPSS / likelihood2.03%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

Files Accessible to External Parties in Opencast

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

Opencast before version 10.6 allows references to local file URLs in ingested media packages, allowing attackers to include local files from Opencast's host machines and making them available via the web interface.

Potential impact

Before Opencast 10.6, Opencast would open and include local files during ingests. Attackers could exploit this to include most local files the process has read access to, extracting secrets from the host machine. For example, to expose the custom.properties of develop.opencast.org via the asset manager, an attacker could have run: An attacker would need to have the privileges required to add new media to exploit this. But these are often widely given.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
MEDIUM
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. Security advisory ↗
  2. Patch commit ↗
  3. Source repository ↗
  4. mvnrepository.com ↗

Record history

Published Dec 14, 2021 · Last refreshed Nov 3, 2026