CVE-2026-61568Network attack vectorHinoki check available

Unauthorized MCP access via DNS rebinding

Published Sep 15, 2026 · Updated Sep 15, 2026

DNS rebinding in GitLab MCP Server before 2.1.30 allows remote attackers to reach a victim's local Streamable HTTP MCP endpoint. The HTTP boundary accepts attacker-controlled Host and Origin headers instead of restricting them to trusted values, allowing rebound requests to enter MCP initialization. Exploitation requires a victim to visit a malicious page while the listener is running, exposing MCP operations under the server's configured GitLab credentials.

CVSS severityUnavailable
Unscored
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

DNS rebinding in GitLab MCP Server before 2.1.30 allows remote attackers to reach a victim's local Streamable HTTP MCP endpoint. The HTTP boundary accepts attacker-controlled Host and Origin headers instead of restricting them to trusted values, allowing rebound requests to enter MCP initialization. Exploitation requires a victim to visit a malicious page while the listener is running, exposing MCP operations under the server's configured GitLab credentials.

The record

CVE
CVE-2026-61568
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
zereight
Product
GitLab MCP Server
Classifications
T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=< 2.1.30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

zereight · GitLab MCP Serverversion=< 2.1.30

Published CVSS scores

No CVSS assessment is available in this record.

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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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