CVE-2023-38687 Execution of arbitrary JavaScript from Svelecte item names
Attackers can execute arbitrary JavaScript via unescaped HTML in Svelecte item names, affecting applications using this Svelte component.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-38687?
CVE-2023-38687 is a medium-severity cross-site scripting vulnerability in mskocik svelecte, published on 14 Aug 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Svelecte is a flexible autocomplete/select component written in Svelte. Svelecte item names are rendered as raw HTML with no escaping. This allows the injection of arbitrary HTML into the Svelecte dropdown. This can be exploited to execute arbitrary JavaScript whenever a Svelecte dropdown is opened. Item names given to Svelecte appear to be directly rendered as HTML by the default item renderer. This means that any HTML tags in the name are rendered as HTML elements not as text. Note that the custom item renderer shown in https://mskocik.github.io/svelecte/#item-rendering is also vulnerable to the same exploit. Any site that uses Svelecte with dynamically created items either from an external source or from user-created content could be vulnerable to an XSS attack (execution of untrusted JavaScript), clickjacking or any other attack that can be performed with arbitrary HTML injection. The actual impact of this vulnerability for a specific application depends on how trustworthy the sources that provide Svelecte items are and the steps that the application has taken to mitigate XSS attacks. XSS attacks using this vulnerability are mostly mitigated by a Content Security Policy that blocks inline JavaScript. This issue has been addressed in version 3.16.3. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-79
Which versions are affected by CVE-2023-38687?
2 open source packages ship an affected version, including svelecte. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
svelecte npm | All versions | 3.16.3 |
svelecte npm | All versions | 3.16.3 |
Products include Mskocik Svelecte.
How do I fix CVE-2023-38687?
Upgrade svelecte to 3.16.3 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-38687 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-38687 exists.
Sources
Also known as GHSA-7h45-grc5-89wq.