CVE-2021-29261

HIGH

The unofficial Svelte extension before 104.8.0 for Visual Studio Code allows attackers to execute arbitrary code via a crafted workspace configuration.

Affects 1 product across 1 vendor.

CVSS 3.17.8
EPSS1.2%
Percentile69th
PatchUnknown
CVSS Vector — Plain English Requires local access, low complexity, no authentication required, requires user interaction, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
◆ AI Analysis — automated analysis, not human-reviewed

The unofficial Svelte extension for Visual Studio Code, versions prior to 104.8.0, is vulnerable to arbitrary code execution through a crafted workspace configuration.

BSID: BS-2021-GLOBAL-264048-H • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

Is this CVE in your environment?

BreachSpider monitors your ICS/OT environment for vulnerabilities like this one. No agents or network access required. Free to start.

Check My Environment →
Frequently Asked Questions
What is CVE-2021-29261?
The unofficial Svelte extension for Visual Studio Code, versions prior to 104.8.0, is vulnerable to arbitrary code execution through a crafted workspace configuration.
What is the CVSS score for CVE-2021-29261?
CVE-2021-29261 has CVSS 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS: 1.2%.
Is CVE-2021-29261 actively exploited?
No confirmed active exploitation of CVE-2021-29261 as of 2026-09-25.
How do I remediate CVE-2021-29261?
Priority: HIGH.
What systems are affected by CVE-2021-29261?
CVE-2021-29261 affects Svelte Svelte.
Vulnerability Details
CVE IDCVE-2021-29261
BSIDBS-2021-GLOBAL-264048-H BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published2021-04-05
Last Modified2026-06-17
ICS Relevance0%
SourceNVD
Official Description

The unofficial Svelte extension before 104.8.0 for Visual Studio Code allows attackers to execute arbitrary code via a crafted workspace configuration.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

An attacker can exploit this vulnerability by creating a malicious workspace configuration file that, when opened in Visual Studio Code with the affected Svelte extension, can execute arbitrary code on the user's system.

Exploitation Likelihood: MEDIUM

Affected Products
VendorProductAffected Versions
Svelte Svelte < 104.8.0
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 2020 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hash9975d65b5c167dd02ae1ae6a503465554aec47b7445e3e3f50e5cbdd81ef39fcbf1dff99cb6e32e242426679e97c0e862126997374905497cab1948bd3538a19
Related CVEs affecting Svelte
CVE-2025-67647 9.1 SvelteKit is a framework for rapidly developing robust, performant web applic... CVE-2023-29008 8.8 The SvelteKit framework offers developers an option to create simple REST API... CVE-2023-29003 8.8 SvelteKit is a web development framework. The SvelteKit framework offers deve... CVE-2024-23641 7.5 SvelteKit is a web development kit. In SvelteKit 2, sending a GET request wit... CVE-2026-22774 7.5 Svelte devalue is a JavaScript library that serializes values into strings wh...
View all Svelte CVEs →

ICS/OT Vulnerability Intelligence for Your Environment

BreachSpider tracks 384,000+ CVEs and matches them to your ICS/OT assets by exact version, with AI analysis, NERC CIP mapping, and vendor PSIRT contacts.

Create a free account →