CVE-2026-19958Public exploitNetwork attack vector

Browser-context code execution via untrusted execute input

Published Aug 16, 2026 · Updated Aug 16, 2026

Code injection in the execute tool in Aleksei Iatsiuk pptr-mcp 0.2.0 through 0.2.7 allows attackers to run JavaScript server-side. executeCode wraps the free-form code input in an asynchronous function and evaluates it with vm.Script.runInContext while exposing a live Puppeteer Browser object. Access to the MCP tool enables arbitrary browser actions, internal-network requests, local-file reads through file URLs, and extraction of persistent browser-session data.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in the execute tool in Aleksei Iatsiuk pptr-mcp 0.2.0 through 0.2.7 allows attackers to run JavaScript server-side. executeCode wraps the free-form code input in an asynchronous function and evaluates it with vm.Script.runInContext while exposing a live Puppeteer Browser object. Access to the MCP tool enables arbitrary browser actions, internal-network requests, local-file reads through file URLs, and extraction of persistent browser-session data.

The record

CVE
CVE-2026-19958
Published
Aug 16, 2026
Updated
Aug 16, 2026
Vendor
Aleksei Iatsiuk
Product
pptr-mcp
Classifications
CWE-74, CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.2.0
  2. Affected versionversion=0.2.1
  3. Affected versionversion=0.2.2
  4. Affected versionversion=0.2.3
  5. Affected versionversion=0.2.4
  6. Affected versionversion=0.2.5
  7. Affected versionversion=0.2.6
  8. Affected versionversion=0.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Aleksei Iatsiuk · pptr-mcpversion=0.2.0; version=0.2.1; version=0.2.2; version=0.2.3; version=0.2.4; version=0.2.5; version=0.2.6; version=0.2.7

Published CVSS scores

6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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