---
id: CVE-2026-77614
title: >-
  Opencast is a free, open-source platform to support the management of
  educational audio and video content
summary: >-
  Opencast is a free, open-source platform to support the management of
  educational audio and video content. Prior to versions 19.7 and 20.2, the
  default security configuration in etc/security/mh_default_org.xml accepts a
  client-selected J…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-384
vendor: opencast
product: opencast
affected:
  - opencast < 19.7
  - 'opencast >= 20.0, < 20.2'
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T16:17:42.480'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77614'
references:
  - url: >-
      https://github.com/opencast/opencast/commit/c36652250a026afb7cf78b663950c702669f1d3f
    label: security-advisories@github.com
  - url: >-
      https://github.com/opencast/opencast/commit/ff84128c9b3bcbd79c28192d25929dab8faf185f
    label: security-advisories@github.com
  - url: 'https://github.com/opencast/opencast/releases/tag/19.7'
    label: security-advisories@github.com
  - url: 'https://github.com/opencast/opencast/releases/tag/20.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p
    label: security-advisories@github.com
  - url: >-
      https://github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-17T15:32:50.306484Z'
ingestedAt: '2026-09-17T15:20:38.998Z'
epss: 0.00549
epssPercentile: 0.4354
---

## Overview

Opencast is a free, open-source platform to support the management of educational audio and video content. Prior to versions 19.7 and 20.2, the default security configuration in etc/security/mh_default_org.xml accepts a client-selected JSESSIONID from the ;jsessionid= URL path parameter and does not replace it when the victim logs in. An unauthenticated attacker can send a crafted link to a victim whose browser has no active Opencast session cookie, wait for the victim to authenticate, and then reuse the known identifier as the victim's authenticated session. This can expose the victim's data and actions and can produce full administrative account takeover when the victim is an administrator. This issue is fixed in versions 19.7 and 20.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.