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CVE-2026-1962· NVD / CVE Program· CNA VulDB

WeKan Attachment Migration attachmentMigration.js AttachmentMigrationBleed access control

A vulnerability has been found in WeKan up to 8.20. The impacted element is an unknown function of the file server/attachmentMigration.js of the component Attachment Migration. The manipulation leads to improper access controls. The attack may be initiated remotely. Upgrading to version 8.21 is sufficient to resolve this issue. The identifier of the patch is 053bf1dfb76ef230db162c64a6ed50ebedf67eee. It is recommended to upgrade the affected component.

MediumCVSS 5.3 · v4.0—No exploit Fix available

Noroxi analysis

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Published
Feb 5, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 25th percentile
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Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulDB
5.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
wekan projectwekan

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • wekan project wekanbefore 8.21

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a WeKan

    • 8.21not affected
    • 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 8.10, 8.11 … (+9)affected

Same product

wekan project: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-30847Wekan Credential Leak via notificationUsers Publication Exposes Password Hashes and Session Tokens
    37Monitor
  • CVE-2026-30844Wekan Vulnerable to SSRF through Lack of Validation or Filtering in Attachment URL Loading
    37Monitor
  • CVE-2026-30843Wekan has Cross-Board IDOR in Custom Fields Update Endpoints
    37Monitor
  • CVE-2025-65780An issue was discovered in Wekan The Open Source kanban board system up to version 18.15, fixed in 18.16.
    35Monitor
  • CVE-2026-30846Wekan Exposes All Global Webhook Integrations through globalwebhooks Publication
    34Monitor
  • CVE-2026-25560WeKan < 8.19 LDAP Authentication Filter Injection
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
n/a WeKan8.21 · descriptionVendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-19630 days apartWeKan Attachment Storage attachments.js MoveStorageBleed access control
    21Monitor
  • CVE-2026-19640 days apartWeKan REST Endpoint boards.js BoardTitleRESTBleed access control
    21Monitor
  • CVE-2026-18941 days apartWeKan REST API checklistItems.js Checklist REST Bleed improper authorization
    21Monitor
  • CVE-2026-18951 days apartWeKan Attachment Storage lists.js applyWipLimit ListWIPBleed access control
    21Monitor
  • CVE-2026-18961 days apartWeKan Migration Operation comprehensiveBoardMigration.js ComprehensiveBoardMigration MigrationBleed access control
    21Monitor
  • CVE-2026-18981 days apartWeKan LDAP User Sync syncUser.js SyncLDAPBleed access control
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-266 · Incorrect Privilege Assignment

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records