VulnerabilityPublished 8 Oct 2025

CVE-2025-11437: JhumanJ OpnForm · Cross-site Scripting

Affects JhumanJ OpnFormSource CVE Database V5

Public exploit available · CVSS 4.8 Medium.

Data as of 26 Oct 2026, 12:29 UTC

CVSS 4.0 base score

4.8Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: High
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
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: High: The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within 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: None: There is no impact to availability within 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 8 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
CVSS exploit maturity: proof of concept public
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), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

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 or the CVSS exploit maturity 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
JhumanJ OpnForm	Affected 1.9.0 – 1.9.3 4 affected builds	Fixed in–

AI-suggested

Ensure the vulnerable feature in OpnForm is disabled until a secure configuration is applied, as recommended by the vendor.
Monitor vendor communications closely for official patches or updates and apply them promptly once released.
Implement strict input validation and sanitization on all user-supplied data in forms to prevent script injection.
Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers.
Educate users about the risks of interacting with suspicious links or content that could trigger XSS attacks.
Conduct regular security assessments and penetration testing focused on web application vulnerabilities, including XSS.
Use web application firewalls (WAFs) with rules tuned to detect and block XSS attack patterns targeting the /api/open/forms/ endpoint.
Review and restrict permissions for the OpnForm application to minimize potential damage from exploitation.
Log and monitor access to the vulnerable endpoint for unusual activity that may indicate exploitation attempts.

Description

A flaw has been found in JhumanJ OpnForm up to 1.9.3. This affects an unknown part of the file /api/open/forms/ of the component Form Editor. This manipulation causes cross site scripting. The attack may be initiated remotely. The exploit has been published and may be used. This issue is currently under review for additional handling. As of right now the vendor has stated that the feature is disabled until the user has configured their own domain which will mitigate this attack vector.

Impact

For European organizations using JhumanJ OpnForm, this vulnerability poses a moderate risk primarily to confidentiality and integrity of user sessions and data accessed via the browser. Attackers could exploit the XSS flaw to execute malicious scripts, potentially leading to session hijacking, credential theft, or defacement of web content. This could undermine trust in affected services and lead to data breaches or regulatory non-compliance under GDPR if personal data is exposed. The requirement for user interaction limits large-scale automated exploitation but targeted phishing or social engineering attacks remain feasible. Organizations relying on OpnForm for critical customer-facing forms or internal workflows may experience reputational damage and operational disruption. The temporary disabling of the vulnerable feature reduces immediate risk, but organizations that have configured custom domains and re-enabled the feature remain exposed. The lack of a patch means organizations must rely on mitigations until updates are available.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 8 Oct 2025, 06:18 UTC

Technical details

References

Community reviews

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