CVE-2026-77256

EPSS 0.41%
Veröffentlicht 22.09.2026 18:48:58
Zuletzt bearbeitet 28.09.2026 13:18:25
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MCP Atlassian: OAuth refresh-token backup file is world-readable under default Unix umask

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 through OAuthConfig._save_tokens_to_file, refresh_token, access_token, and umask, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Betroffene Produkte Warnungen 0 Metriken 3 CWE 1 Referenzen 7

NVD 1 VulnDex Vulnerability Enrichment 3

Daten sind bereitgestellt durch National Vulnerability Database (NVD)

Mcp-atlassian ≫ Mcp Atlassian Version < 0.22.0

VulnDex Vulnerability Enrichment

Diese Information steht angemeldeten Benutzern zur Verfügung.

Zu dieser CVE wurde keine Warnung gefunden.

EPSS Metriken
Typ	Quelle	Score	Percentile
EPSS	FIRST.org	0.41%	0.347

CVSS Metriken
Quelle	Base Score	Exploit Score	Impact Score	Vector String
NIST	6.5	2.8	3.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
security-advisories@github.com	8.3	0	0	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X