CVE-2026-77614 Opencast: Session fixation in login enables account takeover via crafted link
Attackers can hijack user sessions via crafted links due to session fixation, leading to account takeover and data exposure in Opencast.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-77614?
CVE-2026-77614 is a high-severity authentication bypass vulnerability in opencast, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-384
Which versions are affected by CVE-2026-77614?
How do I fix CVE-2026-77614?
No fix has been published for CVE-2026-77614 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-77614 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77614 exists.
Sources
Also known as GHSA-6f53-jp7x-gg7p.