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CVE-2026-77258

Mcp-atlassian Mcp Atlassian path traversal

7.7 HIGHPublic exploitEPSS 0.34%
  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, upload_attachment in src/mcp_atlassian/confluence/attachments.py accepts a caller-controlled file_path and opens the selected server-local file without restricting it to the workspace. A permitted Confluence MCP caller can upload the file as an attachment and disclose data readable by the server process. This issue is fixed in version 0.22.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/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-2026-77258 being actively exploited?

CVE-2026-77258 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.34%.

How severe is CVE-2026-77258?

CVE-2026-77258 has a CVSS 3.1 base score of 7.7, rated high. EPSS estimates a 0.34% probability of exploitation.

Which products are affected by CVE-2026-77258?

Affected products include Mcp-atlassian Mcp Atlassian.

How do I fix CVE-2026-77258?

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

Secuno correlates vulnerabilities like CVE-2026-77258 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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