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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77614
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 15:16:51 UTC
Updated2026-09-17 16:17:42 UTC
DescriptionOpencast 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-384 | CWE-384 CWE-384: Session Fixation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Opencast Opencast affected < 19.7 Not specified
CNA Opencast Opencast affected >= 20.0, < 20.2 Not specified

References

ReferenceSourceLinkTags
github.com/opencast/opencast/releases/tag/20.2 [email protected] github.com
github.com/opencast/opencast/releases/tag/19.7 [email protected] github.com
github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/opencast/opencast/commit/c36652250a026afb7cf78b663950c702669f... [email protected] github.com
github.com/opencast/opencast/commit/ff84128c9b3bcbd79c28192d25929dab8faf... [email protected] github.com
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