CVE-2022-25875: Cross-site Scripting (XSS)

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-07-12 · updated 2026-06-17
Weakness: CWE-79

Description

The package svelte before 3.49.0 are vulnerable to Cross-site Scripting (XSS) due to improper input sanitization and to improper escape of attributes when using objects during SSR (Server-Side Rendering). Exploiting this vulnerability is possible via objects with a custom toString() function.

Affected products

sveltejs svelte: before 3.49.0 — fixed in 3.49.0

How to fix

Upgrade to a fixed version: sveltejs svelte 3.49.0. Check the vendor advisory for mitigations.

References

https://github.com/sveltejs/svelte/commit/f8605d6acbf66976da9b4547f76e90e163899907
https://github.com/sveltejs/svelte/pull/7530%23issuecomment-1158575990
https://snyk.io/vuln/SNYK-JS-SVELTE-2931080
https://github.com/sveltejs/svelte/commit/f8605d6acbf66976da9b4547f76e90e163899907
https://github.com/sveltejs/svelte/pull/7530%23issuecomment-1158575990
https://snyk.io/vuln/SNYK-JS-SVELTE-2931080

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