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CVE-2026-77246

Mcp-atlassian Mcp Atlassian path traversal

7.4 HIGHPublic exploitEPSS 0.43%
  1. Published22 Sept 2026

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, an HTTP transport deployment with READ_ONLY_MODE=false accepts a request without an Authorization identity and permits attacker-controlled Atlassian service headers, including X-Atlassian-Confluence-Url, to select a public attacker hostname or one allowed by MCP_ALLOWED_URL_DOMAINS. A caller can then invoke confluence_upload_attachment or the Jira attachment variant in src/mcp_atlassian/jira/attachments.py with a server-local file_path and cause the MCP process to send the file to the selected attachment endpoint. This issue is fixed in version 0.22.0.

CVSS 3.1 breakdown

Attack vectorAdjacent
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

Mcp-atlassian Mcp Atlassian< 0.22.0

Remediation

Fixed in
Mcp-atlassian Mcp Atlassian≥ 0.22.0

References

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Frequently asked

Is CVE-2026-77246 being actively exploited?

CVE-2026-77246 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.43%.

How severe is CVE-2026-77246?

CVE-2026-77246 has a CVSS 3.1 base score of 7.4, rated high. EPSS estimates a 0.43% probability of exploitation.

Which products are affected by CVE-2026-77246?

Affected products include Mcp-atlassian Mcp Atlassian.

How do I fix CVE-2026-77246?

Upgrade affected software to a fixed version, for example Mcp-atlassian Mcp Atlassian 0.22.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.