CVE-2026-30843Network attack vector

Cross-board data modification via unscoped field lookup

Published Mar 6, 2026 · Updated Mar 6, 2026

IDOR in WeKan 8.32 through 8.33 allows remote authenticated users to modify custom fields on boards they cannot administer. The custom-fields handlers authorize the supplied board ID, then update CustomFields records by field ID alone without checking board membership. Owning any board and learning a foreign field ID through an allowed board export is sufficient to alter that board's field definitions and dropdown items.

CVSS severity9.3
Critical
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IDOR in WeKan 8.32 through 8.33 allows remote authenticated users to modify custom fields on boards they cannot administer. The custom-fields handlers authorize the supplied board ID, then update CustomFields records by field ID alone without checking board membership. Owning any board and learning a foreign field ID through an allowed board export is sufficient to alter that board's field definitions and dropdown items.

The record

CVE
CVE-2026-30843
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
WeKan
Product
WeKan
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 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=>= 8.32, < 8.34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WeKan · WeKanversion=>= 8.32, < 8.34

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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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