high Known exploitedREV. 01
CVE-2026-48710Starlette — Host Header Path Confusion Bypasses Access Checks
Starlette before 1.0.1 did not validate the Host request header, so a crafted header can make the rebuilt request path differ from the path actually routed. Middleware or endpoints that enforce access rules on that rebuilt path, including authentication, can be bypassed.
Read the risk
THE VITAL STATS- CVSS score
- 6.5/ 10 CVSS v3.1
- EPSS probability
- 36% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-05-26
- Added to KEV
- 2026-09-02
- Exploit published
- Yes
- Confidence
- medium
- Kill chain
- initial access
- MITRE ATT&CK
- T1190
- Severity
- high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attacker needsNetwork access to a Starlette app whose access checks use request.url.path rather than the raw scope path; no credentials needed
Fixed instarlette >= 1.0.1
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorybadhost.orgbadhost.org
- 04Vendor advisorygithub.comgithub.com
- 05Vendor advisorygithub.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 | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-20 | claude-code | high |
| title, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-20 | human | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.