svelte is vulnerable to XSS with textarea bind:value
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-79.
Summary
### Summary A server-side rendered `<textarea>` with two-way bound value does not have its value correctly escaped in the rendered HTML. ### Details In SSR, `<textarea bind:value={...}>` does not have its value escaped when it is rendered into the HTML as `<textarea>...</textarea>`. ### PoC Put this in a server-side-rendered Svelte component: ``` <script> let value = `test'"></textarea><script` + `>alert('BIM');</sc` + `ript>`; </script> <textarea bind:value /> ``` ### Impact - Only affects SSR - Needs a `<textarea bind:value>` filled by user content via two-way binding
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | svelte (npm) | 3.0.0 to before 3.59.2 | 3.59.2 | Patch available | GHSA-gw32-9rmw-qwww |
- svelte (npm) Vendor— Affected 3.0.0 to before 3.59.2 Fixed in 3.59.2 Patch available GHSA-gw32-9rmw-qwww
Remediation
- Fix · GHSA-gw32-9rmw-qwww svelte (npm) Fixed in 3.59.2 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-gw32-9rmw-qwww
References
Sources
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