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Apache OFBiz CVE-2026-81816

| EUVDEUVD-2026-117482 LOW
Improper Restriction of XML External Entity Reference (CWE-611)
3.5
CVSS 3.1 · Vendor
View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Reach OFBiz XML-accepting endpoint
  2. Exploit
    Submit XML defining external entity
  3. Execution
    Parser resolves external/internal resource
  4. Impact
    Disclose local files or trigger SSRF

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A02:2025 - Security Misconfiguration
ASVS 5.0
V13 - Configuration XML external entity prevention
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires an attacker to deliver attacker-controlled XML to an OFBiz component whose parser resolves external entities; the specific feature, endpoint, or deployment mode that exposes the vulnerable parser is not identified in the batch announcement, and the trigger is not described in the available sources. Authentication requirements are not confirmed from the available data - no CVSS vector was supplied, so it cannot be stated whether this is pre- or post-authentication. The one concrete boundary confirmed by the vendor is version-based: all releases prior to Apache OFBiz 24.09.08 are affected, and the vendor states upgrading to 24.09.08 is the remediation.

Impact

Risk for this specific CVE cannot be fully quantified from the supplied data, and this must be stated plainly: no CVSS vector or score was provided (CVSS: N/A), no EPSS exploitation-probability score was supplied, there is no CISA KEV listing, and no SSVC technical-impact/automatable breakdown accompanies this entry. The vuln.today decision label is 'awaiting_data', which is consistent with that gap - this is not an act_now or emergency classification, but it also does not mean low risk; it means the signals needed to rank it are not yet present. The only intrinsic signal is the vulnerability class itself: XML external entity (XXE) injection, which by definition permits an attacker who can submit crafted XML to coerce the parser into resolving external entities, typically yielding local file disclosure and/or server-side request forgery, and in some parsers a denial-of-service (entity expansion). Important caveat: this CVE is announced only as a one-line title inside a batch oss-security advisory covering 40+ OFBiz issues, several of which are far more severe (e.g. CVE-2026-68524 pre-auth RCE, CVE-2026-105330 hard-coded JWT key). The authentication requirement for THIS XXE is not stated and cannot be inferred from the available text. Net: treat as a genuine confidentiality/SSRF-class flaw worth patching on the normal cycle via the OFBiz 24.09.08 upgrade, but note that its real-world priority relative to the other OFBiz CVEs in the same batch is currently unestablished pending CVSS/EPSS data.

Exploit ScenarioDerived

An attacker reaches an OFBiz endpoint that accepts and parses XML input and submits a document defining an external entity pointing at a local file or an internal URL; if OFBiz's XML parser resolves external entities, the response or downstream processing leaks local file contents or forces the server to make attacker-directed internal requests (SSRF). No public exploit has been identified at time of analysis, and the exact vulnerable endpoint and whether authentication is required are not described in the available sources.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Nov 04, 2026

XML external entity injection in Apache OFBiz releases before 24.09.08 can expose local files or internal resources when attacker-controlled XML reaches a parser that resolves external entities; the batch advisory does not identify the specific component, endpoint, or deployment mode. All versions prior to 24.09.08 are affected, and the vendor states that upgrading to 24.09.08 addresses this CVE and the other flaws in the same announcement. No public exploit or CISA KEV entry was identified in the supplied data, and risk cannot be fully quantified because no EPSS score, KEV listing, or SSVC breakdown accompanies the entry.

RemediationAI

Upgrade to Apache OFBiz 24.09.08, the vendor-released fix that the advisory states addresses CVE-2026-81816 and the other vulnerabilities in the batch. No targeted workaround, endpoint restriction, or parser configuration is described in the supplied advisory, so the stated remediation is the version upgrade; see https://seclists.org/oss-sec/2026/q4/516 and https://ofbiz.apache.org/.

Affected VersionsENISA

Apache OFBiz 0 <24.09.08

Affected Packages

euvd apache_ofbiz fix: 24.09.08

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Apache OFBiz is a Java-based web framework built around an entity engine, a service engine, and a widget-based UI. CVE-2026-81816 is an XML external entity injection issue: the root cause is XML parsing that resolves external entities, so exploitation depends on delivering attacker-controlled XML into a component whose parser is configured to resolve them. The oss-security batch announcement groups this CVE with many other OFBiz flaws and does not identify the vulnerable feature, endpoint, parser, or deployment mode, and it supplies no CPE or CWE identifiers. The separate assessment records CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:N/C:H/I:N/A:N, indicating a network-reachable issue with high confidentiality impact, while noting that authentication requirements are not confirmed from the available data.

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Severity by source

Vendor (CNA) PRIMARY 3.5 LOW
AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
vuln.today AI 6.5 MEDIUM

XXE in a web framework is reachable by submitting XML over the network (AV:N/AC:L/UI:N) with high confidentiality impact (file/SSRF disclosure); PR:L is a cautious assumption because the auth level is unconfirmed in the sources.

3.1 AV:N/AC:L/PR:L/UI:N/S:N/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
CVSS changed
Nov 09, 2026 - 17:37 NVD
3.5 (LOW)
Patch available
Nov 05, 2026 - 15:17 EUVD
CVE Published
Nov 04, 2026 - 16:33 oss-security
CRITICAL

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Executive ViewAI

Why It Matters

CVE-2026-81816 is a critical XML external entity injection vulnerability in Apache OFBiz, an open-source ERP platform, affecting all releases before 24.09.08. If exploited, it could allow an attacker to read local files or access internal resources, potentially exposing sensitive business data or system configurations. Leadership should care because OFBiz often supports core business processes, and a breach could disrupt operations, leak confidential information, and damage customer trust, though no active exploitation has been observed yet.

Business Impact: High
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations include restricting network access to OFBiz instances to trusted networks only, disabling external entity resolution in XML parsers if configurable, and monitoring for unusual file access or internal resource requests. Once patch is available, apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.3%
Top 79% exploitable
Prevalence
Low
open-source Apache ERP/e-commerce framework, modest production footprint
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity LOW
CISA KEV No
Public POC No
EPSS 0.3%
Patch available Yes
Active threat No
Deciding rule
LOW severity (CVSS 0.1-3.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
High

Priority Score

18
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +18
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Server-Side Request Forgery exploits applications that fetch remote resources based on user-supplied URLs.

XML External Entity (XXE) attacks exploit XML parsers that process Document Type Definitions (DTDs) without proper restrictions.

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