VulnerabilityPublished 6 Oct 2025

CVE-2025-11333: langleyfcu Online Banking System · Cross-site Scripting

Affects langleyfcu Online Banking SystemSource CVE Database V5

Public exploit available · CVSS 4.8 Medium.

Data as of 26 Oct 2026, 10:12 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 18% 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 6 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

AI-suggested

Implement strict input validation on the 'First Name' parameter to reject or sanitize any HTML or script content before processing.
Apply proper output encoding (e.g., HTML entity encoding) when reflecting user input back to the web page to prevent script execution.
Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser.
Conduct regular security code reviews and automated scanning focused on injection vulnerabilities in web forms.
Educate users and staff about phishing risks and suspicious links to reduce successful exploitation via social engineering.
Monitor web application logs for unusual input patterns or error messages that could indicate attempted exploitation.
Coordinate with the vendor to obtain updates or patches promptly, despite the rolling release model, and test them in staging environments before deployment.
Consider implementing multi-factor authentication (MFA) to reduce the impact of stolen credentials.
Use web application firewalls (WAF) with rules targeting XSS attack patterns to provide an additional layer of defense.

Description

A vulnerability was identified in langleyfcu Online Banking System up to 57437e6400ce0ae240e692c24e6346b8d0c17d7a. This impacts an unknown function of the file /customer_add_action.php of the component Add Customer Page. The manipulation of the argument First Name leads to cross site scripting. Remote exploitation of the attack is possible. The exploit is publicly available and might be used. This product follows a rolling release approach for continuous delivery, so version details for affected or updated releases are not provided.

Impact

For European organizations, particularly banks and financial institutions using the langleyfcu Online Banking System, this XSS vulnerability poses a risk of client-side script injection leading to session hijacking, credential theft, or fraudulent transactions. The exploitation could undermine customer trust and lead to regulatory penalties under GDPR due to compromised personal data. The vulnerability could also be leveraged for phishing campaigns targeting bank customers, increasing fraud risk. Although the CVSS score is medium, the financial sector's sensitivity elevates the potential impact. Disruption of banking services or unauthorized transactions could have significant financial and reputational consequences. The rolling release nature of the product may delay timely patching, increasing exposure. European organizations must consider this threat in their risk assessments and incident response planning, especially given the public availability of exploit code.

References

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 6 Oct 2025, 11:31 UTC

Technical details

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