# Improper input validation in Ubiquiti Inc UniFi OS Server and others CVE record · `CVE-2026-34910` - **Identifiers:** `CVE-2026-34910` - **State:** Confirmed - **Severity:** CVSS 10.0 Critical - **Critical:** Yes: KEV, CVSS 9+, CVSS 7+ and EPSS - **CNA:** hackerone - **Weakness (CWE):** [CWE-20](https://cwe.mitre.org/data/definitions/20.html) - **Tags:** [CWE-20](https://agentprime.io/advisories/tag/cwe-20.md) - **Technologies:** [Ubiquiti Inc UniFi OS Server](https://agentprime.io/advisories/technology/ubiquiti-inc-unifi-os-server.md) · [Ubiquiti Inc UDM](https://agentprime.io/advisories/technology/ubiquiti-inc-udm.md) · [Ubiquiti Inc UDM-Pro](https://agentprime.io/advisories/technology/ubiquiti-inc-udm-pro.md) · [Ubiquiti Inc UDM-SE](https://agentprime.io/advisories/technology/ubiquiti-inc-udm-se.md) · [Ubiquiti Inc UDM-Pro-Max](https://agentprime.io/advisories/technology/ubiquiti-inc-udm-pro-max.md) · [Ubiquiti Inc UDM-Beast](https://agentprime.io/advisories/technology/ubiquiti-inc-udm-beast.md) · [Ubiquiti Inc EFG](https://agentprime.io/advisories/technology/ubiquiti-inc-efg.md) · [Ubiquiti Inc UDW](https://agentprime.io/advisories/technology/ubiquiti-inc-udw.md) · [Ubiquiti Inc UDR](https://agentprime.io/advisories/technology/ubiquiti-inc-udr.md) · [Ubiquiti Inc UDR7](https://agentprime.io/advisories/technology/ubiquiti-inc-udr7.md) · [Ubiquiti Inc UDR-5G](https://agentprime.io/advisories/technology/ubiquiti-inc-udr-5g.md) · [Ubiquiti Inc Express 7](https://agentprime.io/advisories/technology/ubiquiti-inc-express-7.md) · [Ubiquiti Inc UNVR](https://agentprime.io/advisories/technology/ubiquiti-inc-unvr.md) · [Ubiquiti Inc UNVR-Pro](https://agentprime.io/advisories/technology/ubiquiti-inc-unvr-pro.md) · [Ubiquiti Inc UNVR-Instant](https://agentprime.io/advisories/technology/ubiquiti-inc-unvr-instant.md) · [Ubiquiti Inc UNVR-G2](https://agentprime.io/advisories/technology/ubiquiti-inc-unvr-g2.md) · [Ubiquiti Inc UNVR-G2-Pro](https://agentprime.io/advisories/technology/ubiquiti-inc-unvr-g2-pro.md) · [Ubiquiti Inc ENVR](https://agentprime.io/advisories/technology/ubiquiti-inc-envr.md) · [Ubiquiti Inc ENVR-Core](https://agentprime.io/advisories/technology/ubiquiti-inc-envr-core.md) · [Ubiquiti Inc UNAS-2](https://agentprime.io/advisories/technology/ubiquiti-inc-unas-2.md) - **Published:** 22 May 2026 - **Updated:** 24 Jun 2026 - **Reviewed by a person:** No Published by the CVE Program (CNA: hackerone) at 22 May 2026, 00:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. ## Critical Critical, because: - In CISA’s KEV catalogue since 23 Jun 2026: it is known to be exploited. - CVSS score 10.0: 9.0 or more. - CVSS score 10.0 (7.0 or more) and EPSS 0.90 (0.1 or more): a high score and a real chance of exploitation in the next 30 days. How we decide what’s critical: ## Affected products, as the CNA wrote them - Vendor: Ubiquiti Inc. Product: UniFi OS Server. - affected: `before 5.0.8` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDM. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDM-Pro. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDM-SE. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDM-Pro-Max. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDM-Beast. - affected: `before 5.1.11` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: EFG. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDW. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDR. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDR7. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UDR-5G. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: Express 7. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNVR. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNVR-Pro. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNVR-Instant. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNVR-G2. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNVR-G2-Pro. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: ENVR. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: ENVR-Core. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNAS-2. - affected: `before 5.1.10` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNAS-4. - affected: `before 5.1.10` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNAS-Pro. - affected: `before 5.1.10` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNAS-Pro-4. - affected: `before 5.1.10` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UNAS-Pro-8. - affected: `before 5.1.10` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UCKP. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UCK. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UCK-Enterprise. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UCG-Ultra. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UCG-Max. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UCG-Fiber. - affected: `before 5.1.12` (semver) - Other versions: unaffected - Vendor: Ubiquiti Inc. Product: UCG-Industrial. - affected: `before 5.1.12` (semver) - Other versions: unaffected ## Not analysed yet We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter. ## Severity and exploitation - 10.0 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`, from CNA (hackerone) - **CISA KEV:** Listed since 23 Jun 2026: known to be exploited. - **EPSS:** 0.90, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline This record came from the full history of the CVE Program, published 22 May 2026. New records show when each source confirmed them. ## Sources - [CVE List: CVE-2026-34910](https://www.cve.org/CVERecord?id=CVE-2026-34910) - [NVD: CVE-2026-34910](https://nvd.nist.gov/vuln/detail/CVE-2026-34910) ### References from the CNA - Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .