grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization
A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93955
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 20:09 UTC · Revision 1
Source evidence
grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization
core-osv · Original sourcePublished 19 Sept 2026, 22:15 UTC
A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.
osv:CVE-2026-93955
Complete source record
{
"id": "93c69736a20a61460fcb779843c7d7257b870faf115545db0695f936dd9fb81f",
"url": "https://osv.dev/vulnerability/CVE-2026-93955",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization",
"summary": "A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.",
"evidence": "osv:CVE-2026-93955",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-93955",
"aliases": [
"CVE-2026-93955"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/grimmory-tools/grimmory",
"type": "GIT",
"events": [
{
"introduced": "1d707ffb0f3599b3dcbda44a62bd4b40c61c2fde"
},
{
"last_affected": "ba47aaad27503e88afc98819318e0771a79f8822"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "3.3.0"
},
{
"last_affected": "3.3.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "3.3.1"
},
{
"last_affected": "3.3.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "3.3.2"
},
{
"last_affected": "3.3.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "3.3.3"
},
{
"last_affected": "3.3.3"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "3.4.0"
},
{
"last_affected": "3.4.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "3.4.1"
},
{
"last_affected": "3.4.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "3.3.3"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"3.3.0",
"3.3.1",
"3.3.2",
"3.3.3",
"3.4.0",
"3.4.1",
"v3.4.1",
"v3.4.0",
"v3.3.3",
"v3.3.2",
"v3.3.1",
"v3.3.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93955.json"
}
}
],
"modified": "2026-10-28T02:30:23.387462619Z",
"provider": "osv",
"references": [
"https://github.com/grimmory-tools/grimmory/",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93955.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-93955",
"https://vuldb.com/cve/CVE-2026-93955",
"https://vuldb.com/submit/943921",
"https://vuldb.com/vuln/407914",
"https://github.com/grimmory-tools/grimmory/issues/2431",
"https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858",
"https://vuldb.com/vuln/407914/cti"
],
"provider_metadata": {
"cwe_ids": [
"CWE-285",
"CWE-639"
],
"cna_assigner": "VulDB",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93955.json"
}
},
"related_cves": [
{
"value": "CVE-2026-93955",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 489654,
"published_at": "2026-09-19T22:15:09.092+00:00"
}