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NVD / CVE Program· CNA GitHub_M

CVE-2025-31486: Vite allows server.fs.deny to be bypassed with .svg or relative paths

Noroxi assessment

Priority: Monitor (action score 33/100)

  • A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 40.4% (FIRST EPSS); higher than 98.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
  • Fixed version: vitejs vite 4.5.12.

Low priority for now. Upgrade to vitejs vite 4.5.12 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Vite is a frontend tooling framework for javascript. The contents of arbitrary files can be returned to the browser. By adding ?.svg with ?.wasm?init or with sec-fetch-dest: script header, the server.fs.deny restriction was able to bypass. This bypass is only possible if the file is smaller than build.assetsInlineLimit (default: 4kB) and when using Vite 6.0+. Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) are affected. This vulnerability is fixed in 4.5.12, 5.4.17, 6.0.14, 6.1.4, and 6.2.5.

MediumCVSS 5.3 · v3.1—Proof of concept Fix available
Published
Apr 3, 2025
Updated
Jun 17, 2026
EPSS
40.4% · 98th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
12 / 30 · 40.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
5.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • vitejs vite

    • < 4.5.12, >=5.0.0, < 5.4.17, >=6.0.0, < 6.0.14, >=6.1.0, < 6.1.4, >=6.2.0, < 6.2.5affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
npmvitefrom 5.0.0 · before 5.4.175.4.17
npmvitefrom 6.0.0 · before 6.0.146.0.14
npmvitefrom 6.1.0 · before 6.1.46.1.4
npmvitefrom 6.2.0 · before 6.2.56.2.5
npmvitebefore 4.5.124.5.12

Same product

vitejs: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-31125Vite has a `server.fs.deny` bypassed for `inline` and `raw` with `?import` queryKEV
    82Now
  • CVE-2025-30208Vite bypasses server.fs.deny when using `?raw??`
    52Plan
  • CVE-2026-39364Vite has a `server.fs.deny` bypass with queries
    33Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2024-45812Sep 17, 2024 · DOM Clobbering gadget found in vite bundled scripts that leads to XSS in Vite
    25Monitor
  • ← EarlierCVE-2025-24010Jan 20, 2025 · Vite allows any websites to send any requests to the development server and read the response
    26Monitor
  • Later →CVE-2025-32395Apr 10, 2025 · Vite has an `server.fs.deny` bypass with an invalid `request-target`
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
vitejs vite4.5.12 · descriptionVendor (CNA)
npm:vite4.5.12Package registry (OSV)
npm:vite5.4.17Package registry (OSV)
npm:vite6.0.14Package registry (OSV)
npm:vite6.1.4Package registry (OSV)
npm:vite6.2.5Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×3

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Nuclei detection templateNuclei template CVE-2025-31486 —
Proof-of-concept repository on GitHubstars:62025-04-07
Proof-of-concept repository on GitHubstars:02025-04-26
Proof-of-concept repository on GitHubstars:02025-07-24

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+3 d
  3. TodayNov 5, 2026+581 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-311253 days apartVite has a `server.fs.deny` bypassed for `inline` and `raw` with `?import` queryKEV
    82Now
  • CVE-2025-3020810 days apartVite bypasses server.fs.deny when using `?raw??`
    52Plan
  • CVE-2026-39363369 days apartVite Affected by Arbitrary File Read via Vite Dev Server WebSocket
    33Monitor
  • CVE-2025-323957 days apartVite has an `server.fs.deny` bypass with an invalid `request-target`
    25Monitor
  • CVE-2024-31207364 days apartVite's `server.fs.deny` did not deny requests for patterns with directories
    23Monitor
  • CVE-2024-45811198 days apartserver.fs.deny bypassed when using ?import&raw in vite
    19Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

nvd-secondary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records