GHSA-gw32-9rmw-qwww
svelte is vulnerable to XSS with textarea bind:value
GHSA-gw32-9rmw-qwww is a high vulnerability (CVSS 8.4) in svelte, published January 16, 2026. No source lists public exploit code. Fixed in svelte 3.59.2.
- Severity
- 8.4 HighCVSS 4.0, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
3.59.2svelte
Description
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
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Active
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Affected packages
| Package | Affected | Fixed |
|---|---|---|
sveltenpm | 3.0.0 up to 3.59.2 | 3.59.2 |
What each source reports
GitHub Advisories Score used
svelte is vulnerable to XSS with textarea bind:value
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
- Record
GHSA-gw32-9rmw-qwww- CVSS 4.0
- 8.4 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:H/SI:H/SA:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
svelte is vulnerable to XSS with textarea bind:value
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
- Record
GHSA-gw32-9rmw-qwww- CVSS 4.0
- 8.4 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:H/SI:H/SA:N - Weakness
- CWE-79
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.