TI-2021-19613 Aliases CVE-2021-43807 GHSA-j4mm-7pj3-jf7v

HTTP Method Spoofing in Opencast

LOW 36CWE-290Published 2021-12-14 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: High
Impact type: Security bypass
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-290.

Summary

Opencast is an Open Source Lecture Capture & Video Management for Education. Opencast versions prior to 9.10 allow HTTP method spoofing, allowing to change the assumed HTTP method via URL parameter. This allows attackers to turn HTTP GET requests into PUT requests or an HTTP form to send DELETE requests. This bypasses restrictions otherwise put on these types of requests and aids in cross-site request forgery (CSRF) attacks, which would otherwise not be possible. The vulnerability allows attackers to craft links or forms which may change the server state. This issue is fixed in Opencast 9.10 and 10.0. You can mitigate the problem by setting the `SameSite=Strict` attribute for your cookies. If this is a viable option for you depends on your integrations. We strongly recommend updating in any case.

Why it matters now

EPSS 0.01463 73rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed opencast (opencast): 9.10org.opencastproject:opencast-common (Maven): 9.10

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
opencast	opencast	before 9.10	9.10	Patch available	CNA
—	org.opencastproject:opencast-common (Maven)	before 9.10	9.10	Patch available	GHSA-j4mm-7pj3-jf7v

opencast Vendoropencast Affected before 9.10 Fixed in 9.10 Patch available CNA
org.opencastproject:opencast-common (Maven) Vendor— Affected before 9.10 Fixed in 9.10 Patch available GHSA-j4mm-7pj3-jf7v

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:apereo:opencast::::::::	before 9.10	Vulnerable	Apereo

cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:* Versions before 9.10 Vulnerable ·Apereo

Remediation

Fix · CNA opencast (opencast) Fixed in 9.10
Fix · GHSA-j4mm-7pj3-jf7v org.opencastproject:opencast-common (Maven) Fixed in 9.10 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-43807
2026-10-03 Alias added: GHSA-j4mm-7pj3-jf7v

References

Exploit 1

https://github.com/opencast/opencast/security/advisories/GHSA-j4mm-7pj3-jf7v

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2021-43807

Other 1

https://github.com/opencast/opencast

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-2021-19627 Files Accessible to External Parties in Opencast CVSS 3.1CRITICAL 9.9
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

See all 20 →

Sources

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