CVE-2026-23822 — Unauthenticated XML External Entity Injection in AOS-8 Instant allows Denial of Service
A vulnerability in the XML handling component of AOS-8 DHCP services could allow an unauthenticated remote attacker to trigger a denial-of-service condition. Successful exploitation could allow an attacker to cause excessive resource consumption upon user interaction, leading to service disruption or reduced availability of the affected system. NOTE: This vulnerability only impacts Access Points running AOS Instant 8.x.x.x
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.3% (30-day exploitation probability)+3
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Arubanetworks Arubaos, Hewlett Packard Enterprise (HPE) ArubaOS (AOS)).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Exploitation requires user interaction: tighten email/web filtering and warn affected users.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Arubanetworks | Arubaos | ≥ 6.4.0.0 and ≤ 6.5.4.24≥ 8.4.0.0 and < 8.10.0.22≥ 8.11.0.0 and < 8.12.0.7≥ 8.13.0.0 and < 8.13.1.2 | Vulnerable | NIST National Vulnerability Database |
| Hewlett Packard Enterprise (HPE) | ArubaOS (AOS) | ≥ 8.13.0.0 and ≤ 8.13.1.1≥ 8.12.0.0 and ≤ 8.12.0.6≥ 8.10.0.0 and ≤ 8.10.0.21 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 5.3 | CVSS 3.1 | Medium | 1.6 | 3.6 | security-alert@hpe.com via NIST National Vulnerability Database |
| 5.3 | CVSS 3.1 | Medium | — | — | hpe via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H (score shown at the top: security-alert@hpe.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.26%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · hewlett packard enterprise (hpe)/arubaos (aos)
- SSVC assessment updated
- Record published
- CVSS changed · 5.3
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
1 on the record
Elsewhere on this site
Related CVEs (same products)
- High CVE-2026-44871 Authenticated Command Injection Vulnerabilities in Command Line Interface (CLI) Service Accessed by PAPI Protocol of AOS-8 and AOS-10 Operating Systems May 12, 2026
- Medium CVE-2026-44874 Authenticated Arbitrary File Download via AOS-10 Web-Based Management Interface May 12, 2026
- High CVE-2026-44867 Authenticated Command Injection Vulnerabilities in the Web-Based Management Interface of AOS-8 and AOS-10 May 12, 2026
- High CVE-2026-44868 Authenticated Command Injection Vulnerabilities in the Web-Based Management Interface of AOS-8 and AOS-10 May 12, 2026
- High CVE-2026-44865 Authenticated Command Injection Vulnerabilities in the Web-Based Management Interface of AOS-8 and AOS-10 May 12, 2026
- High CVE-2026-44866 Authenticated Command Injection Vulnerabilities in the Web-Based Management Interface of AOS-8 and AOS-10 May 12, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No fixed version, patch or mitigation documented.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-23822 is "Unauthenticated XML External Entity Injection in AOS-8 Instant allows Denial of Service", rated Medium. It affects Arubaos (Arubanetworks); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.3 describes technical severity. EPSS 0.26% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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