CVE-2026-73497Patch

LOWCVSS 6.5 · MEDIUM

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). From 0.17.0 until 0.22.0, validate_url_for_ssrf resolves the attacker-controlled X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url header host once at middleware time, but the outbound request is built with the raw hostname and resolves it again at connection time with no IP pinning. An attacker-controlled DNS-rebinding name can return a public IP during validation and 169.254.169.254 or another internal IP during connection, enabling unauthenticated server-side requests to cloud metadata or internal services. The flaw spans src/mcp_atlassian/utils/urls.py, src/mcp_atlassian/servers/main.py, and src/mcp_atlassian/servers/dependencies.py; validate_url_for_ssrf returns only a verdict rather than a pinned IP, UserTokenMiddleware processes the attacker-controlled headers before fetcher creation, and the Jira and Confluence fetchers use the raw hostname. 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-918

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@UpwindMDR46d
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 tweet discloses two vulnerabilities in MCP Atlassian (CVE-2026-73496 path traversal and CVE-2026-73497 SSRF) with technical descriptions, and the primary focus is on recommending an upgrade to version 0.22.0 or later as a remediation measure.
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