CVE-2026-77246Proof of concept (PoC) published · CISA

MCP Atlassian: MCP HTTP Client Server-Local File Exfiltration via Unvalidated Attachment Upload Path

CVSS score

7.4

EPSS probability

%0.4

Risk score

0.0

Published

22 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Vulnerability Timeline (Change History)

CVE-2026-77246 historical changes made to the vulnerability by NVD, CISA and MITRE:

Date	Actor / Source	Action / Description	Type	Previous value	New value
01.10.2026	nvd@nist.gov	Initial Analysis & CVSS Vector Assignment	CVSS V3.1	—	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
22.09.2026	CISA Coordinator	SSVC Risk Re-assessment	SSVC / KEV	exploitation: none	exploitation: none
22.09.2026	MITRE / NVD	New CVE Record Received & Ingested	CVE Created	—	CVE-2026-77246

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