High
WeKan < 8.19 Attachment Upload Object Relationship Validation Bypass
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-25561
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 15:40 UTC · Revision 1
Source evidence
WeKan < 8.19 Attachment Upload Object Relationship Validation Bypass
core-osv · Original sourcePublished 7 Feb 2026, 21:56 UTC
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.
osv:CVE-2026-25561
Complete source record
{
"id": "d408e1a9cfe660dd24914febe04a57297ac099ae81db6735a3f97abf6615943b",
"url": "https://osv.dev/vulnerability/CVE-2026-25561",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "WeKan < 8.19 Attachment Upload Object Relationship Validation Bypass",
"summary": "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.",
"evidence": "osv:CVE-2026-25561",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-25561",
"aliases": [
"CVE-2026-25561"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/wekan/wekan",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "e09e9114aaae041d1cdc8b200f0a116b291d6278"
},
{
"fixed": "1d16955b6d4f0a0282e89c2c1b0415c7597019b8"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:wekan_project:wekan:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "8.19"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "1d16955b6d4f0a0282e89c2c1b0415c7597019b8"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
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],
"modified": "2026-10-28T02:30:37.093745999Z",
"provider": "osv",
"references": [
"https://wekan.fi/",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25561.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-25561",
"https://www.vulncheck.com/advisories/wekan-attachment-upload-object-relationship-validation-bypass",
"https://github.com/wekan/wekan/commit/1d16955b6d4f0a0282e89c2c1b0415c7597019b8",
"https://github.com/wekan/wekan"
],
"provider_metadata": {
"cwe_ids": [
"CWE-863"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25561.json"
}
},
"related_cves": [
{
"value": "CVE-2026-25561",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504171,
"published_at": "2026-02-07T21:56:52.408+00:00"
}