CVE-2026-77271

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Source

https://cve.org/CVERecord?id=CVE-2026-77271

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77271.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-77271

Aliases

Published

2026-09-22T18:00:33Z

Modified

2026-10-28T02:30:33Z

Severity

8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N CVSS Calculator

Summary

MCP Atlassian: Incomplete path traversal fix allows intra-CWD module overwrite and RCE (bypass of CVE-2026-27825)

Details

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_safe_path defaults its base directory to os.getcwd(), and affected Confluence attachment call sites omit base_dir, allowing attacker-selected writes within the working directory. This Python module overwrite can provide code execution when the application later imports the modified module, bypassing the remediation tracked as CVE-2026-27825. This issue is fixed in version 0.22.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-22",
        "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77271.json"
}

References

Affected packages

Git / github.com/sooperset/mcp-atlassian

Affected ranges

Type

GIT

Repo

https://github.com/sooperset/mcp-atlassian

Events

Introduced

Fixed

b041733473f95119dd539542a43c280737a8e460

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "0.22.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "b041733473f95119dd539542a43c280737a8e460"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v0.22.0",
            "range": [
                {
                    "fixed": "b041733473f95119dd539542a43c280737a8e460"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "cpe": "cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "0.22.0"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}

Affected versions

v0.*

v0.1.10

v0.1.11

v0.1.12

v0.1.13

v0.1.14

v0.1.15

v0.1.16

v0.1.4

v0.1.5

v0.1.6

v0.1.7

v0.1.8

v0.10.0

v0.10.1

v0.10.2

v0.10.3

v0.10.4

v0.10.5

v0.10.6

v0.11.0

v0.11.1

v0.11.10

v0.11.11

v0.11.12

v0.11.2

v0.11.3

v0.11.4

v0.11.5

v0.11.6

v0.11.7

v0.11.8

v0.11.9

v0.12.0

v0.13.0

v0.13.1

v0.14.0

v0.14.1

v0.14.2

v0.14.3

v0.15.0

v0.16.0

v0.16.1

v0.17.0

v0.18.0

v0.18.1

v0.19.0

v0.2.0

v0.2.1

v0.2.2

v0.2.3

v0.2.4

v0.2.5

v0.2.6

v0.20.0

v0.20.1

v0.21.0

v0.21.1

v0.3.0

v0.3.1

v0.4.0

v0.5.0

v0.6.0

v0.6.1

v0.6.2

v0.6.3

v0.6.4

v0.6.5

v0.7.0

v0.7.1

v0.8.0

v0.8.1

v0.8.2

v0.8.3

v0.8.4

v0.9.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77271.json"