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CVE-2026-25561· NVD / CVE Program· CNA VulnCheck

WeKan < 8.19 Attachment Upload Object Relationship Validation Bypass

WeKan versions prior to 8.19 contain an authorization weakness in the attachment upload API. The API does not fully validate that provided identifiers (such as boardId, cardId, swimlaneId, and listId) are consistent and refer to a coherent card/board relationship, enabling attempts to upload attachments with mismatched object relationships.

HighCVSS 7.1 · v4.0—No exploit No fix recorded
Published
Feb 7, 2026
Updated
Jul 14, 2026
EPSS
0.4% · 37th percentile
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Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
7.1
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:N/VI:H/VA:N/SC:N/SI:N/SA:N

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

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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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 8.19

Versions reported by the vendor

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

  • WeKan WeKan

    • before 8.19affected

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.

No fix version is recorded for this entry. Check the references for vendor advisories.

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-2026-255650 days apartWeKan < 8.19 Read-only Board Roles Can Update Cards
    28Monitor
  • CVE-2026-255660 days apartWeKan < 8.19 Cross-board Card Move Without Destination Authorization
    28Monitor
  • CVE-2026-255680 days apartWeKan < 8.19 allowPrivateOnly Setting Enforcement Bypass
    28Monitor
  • CVE-2026-258590 days apartWeKan < 8.20 Migration Functionality Insufficient Permission Checks
    28Monitor

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-863 · Incorrect Authorization

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/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

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

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

All records