CVE-2026-77272

6.1 Moyenne

Publiée le 22/09/2026 à 21:16 · Modifiée le 28/09/2026 à 15:10 · Analysée par le NVD · Source : security-advisories@github.com

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the OAuth error query parameter is passed to CallbackHandler._send_response in oauth_setup.py and interpolated into an HTML page without escaping. A crafted authorization callback can inject markup or script that executes in the browser of a user completing the OAuth flow. This issue is fixed in version 0.22.0.

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Produits concernés

Scores CVSS

Version	Score	Source	Vecteur
3.1	5.4 Moyenne	security-advisories@github.com	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`
3.1	6.1 Moyenne	nvd@nist.gov (NVD)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`

Faiblesses (CWE)

CWE-79

Références

https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 Patch
https://github.com/sooperset/mcp-atlassian/pull/1448 Issue TrackingPatch
https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 Release Notes
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g2r2-3j32-j27x ExploitVendor Advisory

CVE-2026-77272

Description

Produits concernés

Scores CVSS

Faiblesses (CWE)

Références

Ailleurs