Widely-used Atlassian Confluence/Jira MCP server; critical RCE enabling full compromise.
CVE-2026-27825
RCE in MCP server before 0.17.0 via unrestricted download_path.
Is CVE-2026-27825 being exploited?
Not confirmed. CVE-2026-27825 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 13% probability of exploitation in the next 30 days.
How severe is CVE-2026-27825?
CVE-2026-27825 is rated Critical with a CVSS score of 9.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-27825?
Yes. A fix has been recorded for CVE-2026-27825. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27825 affect?
CVE-2026-27825 affects Atlassian Confluence MCP server (pre-0.17.0), Atlassian Jira MCP server (pre-0.17.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27825?
Upgrade to MCP 0.17.0+.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can write arbitrary content to any server-writeable path, enabling remote code execution (e.g., cron jobs) without restart.
Immediate action required
- affected< 0.17.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.