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TI-2021-19627 Aliases CVE-2021-43821GHSA-59g4-hpg3-3gcp

Files Accessible to External Parties in Opencast

Priority MEDIUM 46CWE-552Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-552.

Summary

Opencast is an Open Source Lecture Capture & Video Management for Education. Opencast before version 9.10 or 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. Before Opencast 9.10 and 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. An attacker would need to have the privileges required to add new media to exploit this. But these are often widely given. The issue has been fixed in Opencast 10.6 and 11.0. You can mitigate this issue by narrowing down the read access Opencast has to files on the file system using UNIX permissions or mandatory access control systems like SELinux. This cannot prevent access to files Opencast needs to read though and we highly recommend updating.

Why it matters now

EPSS 0.02029 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed opencast (opencast): 10.6org.opencastproject:opencast-ingest-service-impl (Maven): 10.6

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
opencastopencastbefore 10.610.6Patch availableCNA
—org.opencastproject:opencast-ingest-service-impl (Maven)before 10.610.6Patch availableGHSA-59g4-hpg3-3gcp
  • opencast Vendoropencast Affected before 10.6 Fixed in 10.6 Patch available CNA
  • org.opencastproject:opencast-ingest-service-impl (Maven) Vendor— Affected before 10.6 Fixed in 10.6 Patch available GHSA-59g4-hpg3-3gcp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:*before 10.6VulnerableApereo
  • cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:* Versions before 10.6 Vulnerable ·Apereo

Remediation

  • Fix · CNA opencast (opencast) Fixed in 10.6
  • Fix · GHSA-59g4-hpg3-3gcp org.opencastproject:opencast-ingest-service-impl (Maven) Fixed in 10.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43821
  2. 2026-10-03 Alias added: GHSA-59g4-hpg3-3gcp

References

Exploit 1

Patch 2

Advisory 2

Other 1

  • TI-2026-54099 Paella Player: Stored XSS via caption cue text CVSS 3.1HIGH 8.7
  • TI-2026-54098 Opencast: Session fixation in login enables account takeover via crafted link CVSS 3.1HIGH 8.8
  • TI-2025-38256 Opencast's editor accidentally publishes videos/overwrites publications #1626 CVSS 4.0LOW 2.3
  • TI-2020-04262 Authentication Bypass For Endpoints With Anonymous Access in OpenCast CVSS 3.1CRITICAL 10.0
  • TI-2017-14534 Opencast 2.3.2 and older versions are vulnerable to script injections through media and… CVSS 3.0HIGH 8.8
  • TI-2020-04278 Hard-Coded Key Used For Remember-me Token in OpenCast CVSS 3.1HIGH 8.8
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences