CVE-2026-82257
SvelteKit before 2.69.1 Prototype Pollution via File Input
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 28, 2026
- Updated
- Oct 8, 2026
- Reserved
- Aug 28, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Products
| Product | Versions |
|---|---|
kitsveltejs |
|
References
- GitHub Security Advisory (GHSA-866w-xmhq-wj7x)vendor-advisory
- VulnCheck Advisory: SvelteKit before 2.69.1 Prototype Pollution via File Inputthird-party-advisory
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