CVE-2026-82258 PUBLISHED

SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch

Assigner: VulnCheck
Reserved: 28.08.2026 Published: 28.08.2026 Updated: 28.08.2026

SvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows concurrent requests from different users to merge under a single request context. Attackers can exploit specific timing conditions to access sensitive data from other users' concurrent requests.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	High	Integrity	Low	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	sveltejs
Product	kit
Versions	Default: unaffected affected from 2.38.0 to 2.60.1 (excl.) Version 2.60.1 is unaffected

Credits

rafabd1 reporter
elliott-with-the-longest-name-on-github finder
dummdidumm finder

References

Problem Types

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') CWE