CVE-2026-73496Patch

LOWCVSS 7.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the confluence_upload_attachment and confluence_upload_attachments tools pass a client-controlled file_path through src/mcp_atlassian/confluence/attachments.py upload_attachment, and the jira_update_issue attachments parameter reaches src/mcp_atlassian/jira/attachments.py upload_attachment, without confining either path to an approved server workspace. In a remote HTTP, SSE, or multi-user deployment, absolute or traversing paths are resolved on the MCP server and uploaded to Atlassian, allowing a client with write-tool access to disclose server files, environment-held Atlassian credentials, or another tenant's data. A local single-user stdio deployment does not cross this trust boundary because the server runs in the caller's environment. This issue is fixed in version 0.22.0.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-22CWE-73

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Full discourse1 post

Upwind Security MDR@UpwindMDR45d
Patch
🚨 HIGH - Dual Vulnerabilities in MCP Atlassian (CVE-2026-73496 & CVE-2026-73497) MCP Atlassian patched two flaws allowing local file disclosure and SSRF attacks: • CVE-2026-73496: Path traversal in attachment uploads allows attackers to read arbitrary server files and secrets. • CVE-2026-73497: TOCTOU DNS-rebinding SSRF flaw enables access to internal endpoints and cloud metadata. 👉 Affected: mcp-atlassian prior to 0.22.0 | Upgrade to version 0.22.0 or later immediately
Post summary
The text discloses two vulnerabilities in MCP Atlassian and provides technical descriptions for both CVEs. Its primary actionable message is remediation: upgrade mcp-atlassian to version 0.22.0 or later immediately.
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