PatchTheCVECVE-2026-77256: MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira)
CVE-2026-77256 is a medium-severity flaw (CVSS 6.5) affecting mcp atlassian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the plaintext OAuth fallback file containing refresh and access tokens is written with permissions inherited from the process umask. Under common or permissive configurations, other local users can read the backup and retain Atlassian access through the refresh token. The advisory traces the vulnerable input and processing flow th
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 72%) |
| CISA exploited list | No |
| Weakness | CWE-732 |
| Published | 2026-09-22 |
| Last modified | 2026-09-28 |
Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-77256?
mcp atlassian: upgrade to 0.22.0. Exact commands for each OS are on this page.
Is CVE-2026-77256 being exploited?
CVE-2026-77256 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-77256 affect?
CVE-2026-77256 affects mcp atlassian. Severity is medium (CVSS 6.5). MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the plaintext OAuth fallback file containing refresh and access tokens is written with permissions inherited from the proc
How urgent is CVE-2026-77256?
Priority 30/100. No elevated risk signals yet.
Software pages
Atlassian Confluence vulnerabilities · Atlassian Jira vulnerabilities
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