critical Known exploitedREV. 01
CVE-2026-34908Ubiquiti UniFi OS — improper access control to system changes
Ubiquiti's UniFi operating system (OS) does not check permissions properly on some actions, so anyone who can reach the device over the network can make changes to it that only an administrator should be able to make.
Read the risk
THE VITAL STATS- CVSS score
- 10.0/ 10 CVSS v3.1
- EPSS probability
- 85% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-05-22
- Added to KEV
- 2026-06-23
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- initial access
- MITRE ATT&CK
- T1190
- Severity
- critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attacker needsNetwork access to the UniFi OS device; no credentials needed.
Behind the card
4 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorycommunity.ui.comcommunity.ui.com
- 04Exploitpwndefend.compwndefend.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.