Vulnerability in Opencast
CVE-2026-77614
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (46.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Opencast — versions < 19.7, >= 20.0, < 20.2
Weakness classification (CWE)
References
- github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p
- github.com/opencast/opencast/commit/c36652250a026afb7cf78b663950c702669f1d3f
- github.com/opencast/opencast/commit/ff84128c9b3bcbd79c28192d25929dab8faf185f
- github.com/opencast/opencast/releases/tag/19.7
- github.com/opencast/opencast/releases/tag/20.2
Frequently asked questions
- What is CVE-2026-77614?
- CVE-2026-77614 is a high-severity vulnerability in Opencast, classified under Session Fixation. CVSS score: 8.8/10. Published 2026-09-17.
- How severe is CVE-2026-77614?
- High severity. CVSS v3 base score is 8.8 out of 10.