CVE-2026-27825Public exploitNetwork attack vector

Code execution via unconstrained attachment download path

Published Mar 10, 2026 · Updated Mar 10, 2026

Arbitrary file write in sooperset MCP Atlassian before 0.17.0 allows remote attackers to execute code through a crafted attachment download. The confluence_download_attachment tool makes download_path absolute, creates its parent directories, and writes attachment bytes without enforcing containment. Access to the MCP tool and a readable attacker-controlled Confluence attachment is required; impact is limited to paths writable by the server process.

CVSS severity9.0
Critical
EPSS probability12.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in sooperset MCP Atlassian before 0.17.0 allows remote attackers to execute code through a crafted attachment download. The confluence_download_attachment tool makes download_path absolute, creates its parent directories, and writes attachment bytes without enforcing containment. Access to the MCP tool and a readable attacker-controlled Confluence attachment is required; impact is limited to paths writable by the server process.

The record

CVE
CVE-2026-27825
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
sooperset
Product
MCP Atlassian
Classifications
CWE-22, CWE-73, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.17.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

sooperset · MCP Atlassianversion=< 0.17.0

Published CVSS scores

9.0GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.0NIST NVDCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-73External Control of File Name or Path
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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