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OpenProject EUVDEUVD-2026-39877

| CVE-2026-49355 MEDIUM
Information Exposure (CWE-200)
2026-06-26 GitHub_M
Information Disclosure Openproject
4.3
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
4.3 MEDIUM

Network-reachable API requiring authenticated session (PR:L); impact limited to partial confidentiality of linked work package data with no integrity or availability effects.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Patch available
Jun 26, 2026 - 21:02 EUVD
Analysis Generated
Jun 26, 2026 - 20:31 vuln.today

DescriptionCVE.org

OpenProject is open-source, web-based project management software. Prior to 17.4.0, GET /api/v3/meetings/:meeting_id/agenda_items/:agenda_item_id discloses private work package data from a linked work package that belongs to a private/inaccessible project. This vulnerability is fixed in 17.4.0.

AnalysisAI

The meeting agenda items REST API in OpenProject before 17.4.0 leaks private work package data to authenticated users who lack project-level access. When a meeting agenda item is linked to a work package belonging to a private or inaccessible project, the GET /api/v3/meetings/:meeting_id/agenda_items/:agenda_item_id endpoint returns that work package's confidential data in its response, silently bypassing project-level authorization checks. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as low-privileged OpenProject user
Delivery
Identify meeting ID accessible to attacker's account
Exploit
Enumerate GET /api/v3/meetings/:id/agenda_items/:item_id requests
Execution
Receive private work package data in API response
Impact
Exfiltrate sensitive project information from restricted projects
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated session with at least low-privilege access (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 4.3 (Medium) with vector AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N accurately captures the risk profile: network-accessible, low-complexity, but requiring an authenticated session (PR:L), with limited confidentiality impact and no integrity or availability consequences. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated user with a low-privilege OpenProject account and access to a meeting sends a GET request to /api/v3/meetings/:meeting_id/agenda_items/:agenda_item_id for an agenda item that an administrator has linked to a work package from a private project. The API response includes the private work package's title, description, status, and other metadata that the requester is not authorized to see. …
Remediation Vendor-released patch: 17.4.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-39877 vulnerability details – vuln.today
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