CVE-2026-30615

Remote command execution via MCP configuration overwrite

Published Apr 15, 2026 · Updated Apr 15, 2026

Prompt injection in Windsurf 1.9544.26 allows remote attackers to execute arbitrary commands when the application processes crafted HTML. Malicious instructions in the HTML cause Windsurf to overwrite the local MCP configuration and automatically register an attacker-controlled STDIO server whose command is launched. Processing attacker-controlled HTML is the disclosed gate; command execution occurs with the user's privileges without further interaction and can persist in the MCP configuration.

CVSS severity8.0
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prompt injection in Windsurf 1.9544.26 allows remote attackers to execute arbitrary commands when the application processes crafted HTML. Malicious instructions in the HTML cause Windsurf to overwrite the local MCP configuration and automatically register an attacker-controlled STDIO server whose command is launched. Processing attacker-controlled HTML is the disclosed gate; command execution occurs with the user's privileges without further interaction and can persist in the MCP configuration.

The record

CVE
CVE-2026-30615
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1203Exploitation for Client Execution

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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