CVE-2026-90535 json
Flowise before 3.1.4 Denial of Service via text-to-speech/abort
published 2mo ago modified last mo. also EUVD-2026-76853 , GHSA-xhxx-56g3-mx2r
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository FlowiseAI/Flowise. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
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.
Patch / fix
- FlowiseAI Flowise 3.1.4
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Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.3 | 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 |
| CNA | 4.0 | 6.3 | 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/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 | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
- FlowiseAI Flowise
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r
vendor-advisory, exploit, advisory
-
vulncheck.com
/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abort
third-party-advisory
Sources
- CVE List CVE-2026-90535
- NVD CVE-2026-90535
- Maintainer advisory GHSA-xhxx-56g3-mx2r
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of FlowiseAI/Flowise published their own advisory on GitHub. Reviewed sources take precedence over it.