Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck
CVE-2026-82258SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch
Medium 5.9
In plain English
A medium-severity race condition in kit from sveltejs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)5.9Medium
Exploit odds (30 days)0.2%top 85.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @sveltejs/kit | 2.60.1 | GHSA-hgv7-v322-mmgr |
Affected products (as reported)
Weakness: CWE-362 · 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
References
- GitHub Security Advisory (GHSA-hgv7-v322-mmgr) vendor-advisory
- VulnCheck Advisory: SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch third-party-advisory