CVE-2026-90535

HIGHNVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory published 2026-09-12. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 15, 2026

Advisory Details (2)

Auto-updated Sep 12, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Flowise before 3.1.4 Denial of Service via text-to-speech/abort | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abort
github Patch Available🟡 PoC Available

Unauthenticated Denial of Service via text-to-speech/abort Endpoint Allows Termination of Active Chatflow Predictions · Advisory · FlowiseAI/Flowise · GitHub

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r

Vendor Advisories for CVE-2026-90535(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 11:55 UTCGHSA enrichment
  2. 2026-09-24 23:07 UTCEG score recompute
  3. 2026-09-24 23:07 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 09:44 UTCGHSA enrichment
  6. 2026-09-23 20:56 UTCEG score recompute
  7. 2026-09-23 20:56 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 08:09 UTCGHSA enrichment
  10. 2026-09-22 19:21 UTCEG score recompute
  11. 2026-09-22 19:21 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 06:33 UTCEG score recompute
  14. 2026-09-22 06:33 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 17:45 UTCGHSA enrichment
  17. 2026-09-21 04:56 UTCEG score recompute
  18. 2026-09-21 04:56 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 15:52 UTCGHSA enrichment
  21. 2026-09-20 03:04 UTCEG score recompute
  22. 2026-09-20 03:03 UTCGHSA enrichment
  23. 2026-09-19 14:16 UTCGHSA enrichment
  24. 2026-09-19 01:29 UTCEG score recompute
  25. 2026-09-19 01:28 UTCGHSA enrichment
Show 26 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 12:40 UTCGHSA enrichment
  3. 2026-09-17 23:52 UTCEG score recompute
  4. 2026-09-17 23:52 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 10:25 UTCGHSA enrichment
  7. 2026-09-16 21:37 UTCEG score recompute
  8. 2026-09-16 21:36 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 08:49 UTCEG score recompute
  11. 2026-09-16 08:49 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 19:12 UTCEG score recompute▲ 1.20
  14. 2026-09-15 19:12 UTCGHSA enrichment
  15. 2026-09-15 19:12 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 21:18 UTCGHSA enrichment
  18. 2026-09-14 17:28 UTCEG score recompute
  19. 2026-09-14 17:28 UTCGHSA enrichment
  20. 2026-09-14 16:20 UTCEG score recompute
  21. 2026-09-14 16:20 UTCGHSA enrichment
  22. 2026-09-13 16:48 UTCEPSS rescore
  23. 2026-09-13 15:37 UTCGHSA enrichment
  24. 2026-09-12 13:25 UTCEG score recompute
  25. 2026-09-12 12:19 UTCEG score recompute
  26. 2026-09-12 12:18 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90535?
CVE-2026-90535 is a high vulnerability published on September 12, 2026. 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…
When was CVE-2026-90535 disclosed?
CVE-2026-90535 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90535 actively exploited?
CVE-2026-90535 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.1% of all scored CVEs.
What is the CVSS score of CVE-2026-90535?
CVE-2026-90535 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-90535?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90535, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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