CVE-2026-82257CWE-1321

CVE-2026-82257

Medium · published August 28, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
28.4
In the wild
Unconfirmed
What it is

SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00358 · 28.4th percentile
Weakness
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Published
2026-08-28T16:16Z
Affected products (1)
ProductVersionsFixed in
svelte/sveltekit< 2.69.12.69.1
References (2)
https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x · [email protected]https://www.vulncheck.com/advisories/sveltekit-before-2.69.1-prototype-pollution-via-file-input · [email protected]
EPSS history
Timeline
  • 30 AUG 16:19Z
    EPSS moved — → 0%
    epss
  • 28 AUG 10:49Z
    SvelteKit before 2.69.1 Prototype Pollution via File Input
    cvelistv5