8.8

CVE-2026-77614

Opencast: Session fixation in login enables account takeover via crafted link

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstelleropencast
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Produkt opencast
Version < 19.7
Status affected
Version >= 20.0, < 20.2
Status affected
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.41% 0.345
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-384 Session Fixation

Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.

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