VulnSocial

CVE-2026-48529Disclosure

LOWCVSS 6.0 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

GitHub MCP Server is GitHub's official MCP Server. From 0.22.0 until 1.1.2, when running in HTTP mode with --lockdown-mode enabled, the RepoAccessCache is implemented as a process-global singleton initialized with the first authenticated user's GraphQL client. All subsequent requests from different users share this singleton and their lockdown-related GraphQL queries are executed using the first user's credentials. The singleton is never updated to reflect later users' tokens. This vulnerability is fixed in 1.1.2.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-284

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • 2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-06-26: 2Technical Details · 2026-06-26: 106-26
Signal classification2 categories
Disclosure
150.0%
General
150.0%
Referenced assets3 URLs
Full discourse2 posts
  • Mr. OS@ksg93rd
    Disclosure

    CVE-2026-48529: GitHub MCP Server HTTP lockdown-mode singleton can mix users’ GraphQL clients In HTTP mode with --lockdown-mode, a process-global RepoAccessCache singleton can be initialized with the first user’s authenticated GraphQL client and then reused for later users’ requests, creating a cross-user trust-boundary failure via shared server state. #MCP #AgentSecurity #AISecurity #Advisory https://github.com/advisories/GHSA-pjp5-fpmr-3349

    Post summary

    An advisory discloses a cross‑user trust‑boundary flaw in GitHub MCP Server’s HTTP lockdown‑mode, where a process‑global singleton can leak GraphQL client state between users.

    10011203
    3.3K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-48529 Credential Reuse Vulnerability in GitHub MCP Server HTTP Lockdown Mode https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-48529 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3

    Post summary

    The text announces CVE-2026-48529, a credential reuse vulnerability in GitHub MCP Server's HTTP Lockdown Mode, providing links to vulnerability details and alert notifications, but no additional technical or exploitation information.

    00010117
    4.1K followersView on X

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