high Known exploitedREV. 01
CVE-2026-55255Langflow — cross-tenant flow execution via unchecked flow id
Langflow before 1.9.1 does not check who owns a flow: a signed-in user who names another user's flow identifier on the responses endpoint has that flow executed for them, reaching the other tenant's data and integrations.
Read the risk
THE VITAL STATS- CVSS score
- 8.4/ 10 CVSS v3.1
- EPSS probability
- 1% Likelihood of exploitation
- Attack complexity
- High Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-06-23
- Added to KEV
- 2026-07-07
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- execution
- MITRE ATT&CK
- —
- Severity
- high
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Attacker needsAny authenticated account on the Langflow instance, plus the identifier of the target flow.
Fixed inLangflow 1.9.1
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorygithub.comgithub.com
- 04Vendor advisorygithub.comgithub.com
- 05Exploitgithub.comgithub.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-23 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-23 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-23 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-23 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.