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GHSA-gw32-9rmw-qwww
No affected components available
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
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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