CVE-2026-34736Public exploitNetwork attack vector

Email verification bypass via exposed activation key

Published Apr 2, 2026 · Updated Apr 2, 2026

Improper authentication in Open edX Platform from Maple to before Ulmo allows remote attackers to bypass email verification. UserReadOnlySerializer.to_representation returns an inactive user's activation_key through /api/user/v1/accounts/, while the OAuth2 password grant issues that user a token. Unauthenticated access is sufficient to register an inactive account, read its key, and activate it without controlling the supplied email address.

CVSS severity5.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Open edX Platform from Maple to before Ulmo allows remote attackers to bypass email verification. UserReadOnlySerializer.to_representation returns an inactive user's activation_key through /api/user/v1/accounts/, while the OAuth2 password grant issues that user a token. Unauthenticated access is sufficient to register an inactive account, read its key, and activate it without controlling the supplied email address.

The record

CVE
CVE-2026-34736
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Open edX
Product
Open edX Platform
Classifications
CWE-287, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= maple, < ulmo

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open edX · Open edX Platformversion=>= maple, < ulmo

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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