What is CVE-2026-77614?

CVE-2026-77614 is Opencast: Session fixation in login enables account takeover via crafted link. The supplied enrichment data classifies it as Unclassified mapped to CWE-384 CWE-384.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Active exploitation is not confirmed from current sources for CVE-2026-77614. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

No. CVE-2026-77614 is not listed in CISA KEV in the supplied enrichment data. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

Is there a public exploit?

A public PoC is not confirmed from current sources for CVE-2026-77614. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with web/proxy/WAF logs, application logs, network IDS/IPS where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2026-77614 using CVSS 8.8, EPSS 0%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

No public threat actor linkage is confirmed from current sources. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Prioritize based on EPSS, PoC availability, and external exposure. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

high

CVE-2026-77614

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.

Published Sep 17, 2026Updated Sep 17, 2026Sources: NVD, opencast (CNA), GitHub, SOCRadar CTI

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

ahead of 0% of scored CVEs

Affects

opencast

2 products listed

CVSS base

8.8

high

Remediation

The vendor's own words where we have them.

Upgrade opencast to a fixed release. Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Prioritize based on EPSS, PoC availability, and external exposure.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
opencast	opencast	< 19.7	Vulnerable
opencast	opencast	>= 20.0, < 20.2	Vulnerable

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

High

Confidentiality

High

Integrity

High

Scope

Unchanged

Attack Complexity

Low

Attack Vector

Network

Privileges Req

None

User Interaction

Required

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
8.8	CVSS 3.1	high	2.8	5.9	GitHub (CNA), opencast (CNA)

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

What this weakness leads to

MITRE's own consequences and mitigations for the weakness class — the authority's wording, not guidance derived from the CVSS vector.

MITRE

CWE-384 · Session Fixation

Gain Privileges or Assume Identity::

Mitigation: Invalidate any existing session identifiers prior to authorizing a new user session.

Weakness & attack patterns

CWE-384

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

CAPEC-196 · Session Credential Falsification through ForgingCAPEC-31 · Accessing/Intercepting/Modifying HTTP CookiesCAPEC-21 · Exploitation of Trusted IdentifiersCAPEC-61 · Session FixationCAPEC-59 · Session Credential Falsification through PredictionCAPEC-60 · Reusing Session IDs (aka Session Replay)CAPEC-39 · Manipulating Opaque Client-based Data Tokens

T1134.002Access Token Manipulation: Create Process with Token
T1134.003Access Token Manipulation: Make and Impersonate Token
T1606Forge Web Credentials

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Search application, proxy, and WAF logs for requests touching /security/mh_default_org.xml.
Prioritize edge telemetry for network-reachable opencast.

web/proxy/WAF logsapplication logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 8.8 (AV:N)
Sep 17, 2026 · NVD
Initial · CVE published
Sep 17, 2026 · NVD
CVE published by MITRE.
Sep 17, 2026 · SOCRadar CTI

References

5 on the record

github.com/opencast/opencast/commit/c36652250a026afb7cf78b663950c702669f1d3f
Exploit, Third Party Advisory, Mitre
github.com/opencast/opencast/commit/ff84128c9b3bcbd79c28192d25929dab8faf185f
Exploit, Third Party Advisory, Mitre
github.com/opencast/opencast/releases/tag/19.7
Exploit, Third Party Advisory, Mitre
github.com/opencast/opencast/releases/tag/20.2
Exploit, Third Party Advisory, Mitre
github.com/opencast/opencast/security/advisories/GHSA-6f53-jp7x-gg7p
Exploit, Third Party Advisory, Mitre

Elsewhere on this site

opencastevery CVE for this vendor
Unclassifiedsame class
CWE-384other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2026-77614 is Opencast: Session fixation in login enables account takeover via crafted link, a high vulnerability affecting opencast from opencast. The current evidence does not list it in CISA KEV, and the exploit status is: Active exploitation is not confirmed from current sources for CVE-2026-77614. Public exploit evidence is: A public PoC is not confirmed from current sources for CVE-2026-77614. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 8.8 describes technical severity, while EPSS 0% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.