CVE-2026-77614

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

Published: Sep 17, 2026Updated: Sep 17, 2026 Sources: CVE List NVDCWE-384

8.8HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-384

Affected Products

opencast

oss-project

opencastOn-prem

Communications / video-conferencing

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Defense Evasion

Initial Access

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References

https://github.com/opencast/opencast/commit/c36652250a026afb7cf78b663950c702669f1d3f

github.com

https://github.com/opencast/opencast/commit/ff84128c9b3bcbd79c28192d25929dab8faf185f

github.com

https://github.com/opencast/opencast/releases/tag/19.7

github.com

and 2 more references View all →

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