VulnerabilityPublished 18 Nov 2025Updated 18 Feb 2026

CVE-2025-41350: Informatica del Este WinPlus · XSS or 'Cross-site Scripting'

Affects Informatica del Este WinPlusSource CVE Database V5

Not known to be exploited · CVSS 5.1 Medium.

Data as of 26 Oct 2026, 11:42 UTC

CVSS 4.0 base score

5.1Medium

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:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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

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: 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: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent 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 Subsequent System.
Subsequent 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 Subsequent 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.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Nov 2025
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 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
Informatica del Este WinPlus	Affected =24.11.27	Fixed in–

AI-suggested

Organizations should implement multiple layers of defense to mitigate this vulnerability. First, apply patches or updates from Informatica del Este as soon as they become available. In the absence of patches, enforce strict input validation and sanitization on the 'descripcion' parameter to neutralize potentially malicious scripts. Implement output encoding on all user-generated content before rendering it in the browser to prevent script execution. Restrict user privileges to the minimum necessary to reduce the risk posed by compromised accounts. Employ Web Application Firewalls (WAFs) with rules designed to detect and block XSS payloads targeting the affected endpoint. Conduct regular security awareness training to help users recognize suspicious activity. Monitor logs for unusual POST requests to the vulnerable endpoint and anomalous user behavior. Finally, consider implementing Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers.

Description

Stored Cross-site Scripting (XSS)vylnerability type in WinPlus v24.11.27 byInformática del Este that consist of an stored XSS of a stored XSS due to a lack of proper validation of user input by sending a POST request using the 'descripcion' parameter in '/WinplusPortal/ws/sWinplus.svc/json/savesoldoc_post'. This vulnerability could allow a remote user to send a specially crafted query to an authenticated user and steal their cookie session details.

Impact

For European organizations, exploitation of this vulnerability could result in session hijacking, unauthorized access to sensitive information, and potential lateral movement within the network if attackers impersonate legitimate users. This is particularly concerning for organizations that rely on WinPlus for critical business processes or data management. The stored XSS nature means that malicious scripts persist on the server, increasing the risk of widespread impact among users who access the compromised content. Confidentiality is primarily at risk due to cookie theft, but integrity and availability impacts are minimal. The requirement for authenticated access limits the attack surface but does not eliminate risk, especially in environments with many users or weak authentication controls. The vulnerability could be leveraged in targeted attacks against sectors such as finance, government, healthcare, or manufacturing where WinPlus is deployed. Additionally, the ability to steal session cookies could facilitate further attacks such as privilege escalation or data exfiltration.

Summary

CVE-2025-41350 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79 affecting Informatica del Este's WinPlus software, specifically version 24.11.27. The vulnerability occurs due to improper neutralization of user-supplied input during web page generation. The affected parameter is 'descripcion' in the POST request to the endpoint '/WinplusPortal/ws/sWinplus.svc/json/savesoldoc_post'. Because the application fails to properly validate or sanitize this input, an attacker with authenticated access can inject malicious JavaScript code that is stored on the server and later executed in the browsers of other users who view the affected content. This can lead to session cookie theft, enabling attackers to impersonate legitimate users and potentially escalate privileges or access sensitive data. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L means low privileges), user interaction required (UI:P), and limited scope and impact confined to confidentiality (VC:N), integrity (VI:N), and availability (VA:N). The medium severity score of 5.1 reflects these factors. No patches or public exploits are currently known, but the vulnerability poses a risk especially in environments where multiple users interact with the WinPlus portal. The flaw highlights the need for robust input validation and output encoding in web applications to prevent script injection attacks.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

incibe.es/en/incibe-cert/notices/aviso/stored-cross-site-scripting-xss-winplus-informatica-del-este (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Feb 2026, 13:51 UTC

WeaknessesCWE-79

Technical details

References

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