Medium
Flowise before 3.1.4 Denial of Service via text-to-speech/abort
Type: advisorySources: OSV
Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification. Attackers can terminate active chatflow predictions for any user by submitting requests with known chatflow and chat identifiers, causing targeted service disruption.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-90535
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:13 UTC · Revision 1
Source evidence
Flowise before 3.1.4 Denial of Service via text-to-speech/abort
core-osv · Original sourcePublished 12 Sept 2026, 12:08 UTC
Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification. Attackers can terminate active chatflow predictions for any user by submitting requests with known chatflow and chat identifiers, causing targeted service disruption.
osv:CVE-2026-90535
Complete source record
{
"id": "2bc1224f789b46ce0db813cf4f3ef3b369844dfdfb03d368ac55c40ddf24cc6d",
"url": "https://osv.dev/vulnerability/CVE-2026-90535",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Flowise before 3.1.4 Denial of Service via text-to-speech/abort",
"summary": "Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification. Attackers can terminate active chatflow predictions for any user by submitting requests with known chatflow and chat identifiers, causing targeted service disruption.",
"evidence": "osv:CVE-2026-90535",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-90535",
"aliases": [
"CVE-2026-90535",
"GHSA-xhxx-56g3-mx2r"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/flowiseai/flowise",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "a65f81bb43ef66d3ce734bf0dff4223ae8041c95"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.1.4"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"cpe": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.1.4"
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],
"source": "CPE_RANGE"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90535.json"
}
}
],
"modified": "2026-10-28T02:30:29.250482960Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90535.json",
"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r",
"https://nvd.nist.gov/vuln/detail/CVE-2026-90535",
"https://www.vulncheck.com/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abort"
],
"provider_metadata": {
"cwe_ids": [
"CWE-862"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90535.json"
}
},
"related_cves": [
{
"value": "CVE-2026-90535",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496263,
"published_at": "2026-09-12T12:08:44.062+00:00"
}