CVE-2026-2074VulnerabilityPublished 7 Feb 2026Updated 23 Feb 2026

CVE-2026-2074: O2OA · XML External Entity Reference

Affects O2OASource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 7 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
O2OA	Affected =9.0	Fixed in–
GitHubo2oa/o2oa`pkg:github/o2oa/o2oa`Other threats	Affected =9.0	Fixed in–

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AI-suggested

To mitigate CVE-2026-2074, organizations should first isolate and restrict access to the vulnerable O2OA endpoint /x_program_center/jaxrs/mpweixin/check, limiting exposure to trusted networks only. Implement network-level controls such as firewalls or web application firewalls (WAFs) to detect and block malicious XML payloads containing external entity references. Disable or properly configure XML parsers used by O2OA to prevent processing of external entities; this typically involves disabling DTD processing or enabling secure parser features that prohibit external entity resolution. Monitor logs for unusual XML requests or error patterns indicative of XXE exploitation attempts. If possible, upgrade to a patched version once available or apply vendor-provided fixes. In the absence of vendor patches, consider deploying runtime application self-protection (RASP) solutions that can intercept and block malicious XML inputs. Conduct thorough security testing and code review of custom integrations with O2OA to ensure no additional XML processing vulnerabilities exist. Educate security teams about this vulnerability and maintain heightened alertness for exploitation attempts. Finally, maintain regular backups and incident response plans to quickly recover from potential compromises.

Description

A vulnerability was identified in O2OA up to 9.0.0. This impacts an unknown function of the file /x_program_center/jaxrs/mpweixin/check of the component HTTP POST Request Handler. The manipulation leads to xml external entity reference. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Impact

The impact of CVE-2026-2074 can be significant for organizations using O2OA 9.0.0 or earlier. Successful exploitation can lead to unauthorized disclosure of sensitive information through reading local files or internal resources, potentially exposing credentials, configuration files, or other confidential data. Integrity could be compromised if attackers manipulate XML processing to alter application behavior or data. Availability impacts may arise from denial-of-service conditions triggered by malicious XML payloads. Since the vulnerability is remotely exploitable without authentication or user interaction, attackers can target exposed O2OA instances over the internet or internal networks. This increases the risk of automated scanning and exploitation attempts, especially given the availability of public exploit code. Organizations relying on O2OA for critical business processes or handling sensitive data face risks of data breaches, compliance violations, and operational disruptions. The vendor's lack of response and absence of patches further exacerbate the threat, requiring organizations to take immediate protective actions. The scope of affected systems is limited to O2OA deployments, but given O2OA's use in certain enterprise environments, the impact can be material for affected entities.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 23 Feb 2026, 22:12 UTC

Technical details

References

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