CVE-2026-35454Network attack vector

Arbitrary file write via VSIX path traversal

Published Apr 6, 2026 · Updated Apr 6, 2026

Path traversal in Coder Code Extension Marketplace before 2.4.2 allows remote authenticated users to write arbitrary local files via a VSIX. ExtractZip forwards attacker-controlled ZIP entry names to AddExtension, which joins them to the extension directory without checking that the resolved path remains inside it. Any upload-capable role can target paths writable by the marketplace process, enabling persistence or code execution under its privileges.

CVSS severity8.7
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Coder Code Extension Marketplace before 2.4.2 allows remote authenticated users to write arbitrary local files via a VSIX. ExtractZip forwards attacker-controlled ZIP entry names to AddExtension, which joins them to the extension directory without checking that the resolved path remains inside it. Any upload-capable role can target paths writable by the marketplace process, enabling persistence or code execution under its privileges.

The record

CVE
CVE-2026-35454
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Coder
Product
Code Extension Marketplace
Classifications
CWE-22, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 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=< 2.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Coder · Code Extension Marketplaceversion=< 2.4.2

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1105Ingress Tool Transfer

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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