CVE-2026-77614 Details
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.
A session fixation vulnerability has been identified in Opencast versions prior to 19.7 and 20.2. The issue arises because the default security configuration accepts a client-selected JSESSIONID from the URL path parameter and fails to replace it when the user logs in. This allows an unauthenticated attacker to send a crafted link to a victim, who, upon logging in, inadvertently adopts the attacker's session ID. As a result, the attacker can hijack the victim's session, access their data and actions, and potentially take over an administrative account if the victim holds that role.
Users can upgrade to Opencast versions 19.7 or 20.2, both of which include the necessary fix. Instructions for downloading these versions are available on the Opencast GitHub Releases page.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 17, 2026CISA-ADP
Assessed Sep 17, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/opencast/opencast/commit/c36652250a026afb7cf78b663950c702669f1d3f | [email protected] | Source CodeVendor |
| https://github.com/opencast/opencast/commit/ff84128c9b3bcbd79c28192d25929dab8faf185f | [email protected] | Source CodeVendor |
| https://github.com/opencast/opencast/releases/tag/19.7 | [email protected] | Release NotesVendor |
| https://github.com/opencast/opencast/releases/tag/20.2 | [email protected] | Release NotesVendor |
| https://github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-384 | Session Fixation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Opencast | < 19.7 < 20.2 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 17, 2026 | CVE Modified | CISA-ADP |
| Sep 17, 2026 | New CVE Received | [email protected] |