CVE-2025-10388VulnerabilityPublished 14 Sep 2025Updated 15 Sep 2025

CVE-2025-10388: Selleo Mentingo · Cross Site Scripting

Affects Selleo MentingoSource CVE Database V5

Not known to be exploited · CVSS 5.1 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score

5.1Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 17% 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:L/VA:N/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
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: 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: 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 14 Sep 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 2026-10-26.

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
Selleo Mentingo	Affected =2025.08.27	Fixed in–

AI-suggested

Organizations should implement immediate compensating controls to mitigate the risk. These include input validation and output encoding on the client side to prevent script execution, deploying web application firewalls (WAFs) with rules targeting XSS payloads specific to the vulnerable endpoint, and monitoring logs for suspicious activity related to the /api/course/enroll-course endpoint. User education to recognize phishing attempts leveraging this vulnerability can reduce successful exploitation. Network segmentation to limit access to the Mentingo platform and enforcing strict Content Security Policy (CSP) headers can further reduce the impact of XSS attacks. Until an official patch is released, organizations should consider restricting or closely monitoring access to the vulnerable version of Mentingo, and if feasible, temporarily disabling the affected functionality. Regular vulnerability scanning and penetration testing focused on this vector are recommended to detect exploitation attempts.

Description

A vulnerability was identified in Selleo Mentingo 2025.08.27. This issue affects some unknown processing of the file /api/course/enroll-course of the component Create New Course Basic Settings. Such manipulation of the argument Description leads to cross site scripting. The attack can be launched 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

For European organizations using Selleo Mentingo 2025.08.27, this vulnerability poses a moderate risk. As Mentingo is a platform likely used for course management and enrollment, exploitation could allow attackers to steal session tokens or manipulate user actions, potentially leading to unauthorized access to sensitive educational or organizational data. The impact is heightened in environments where Mentingo integrates with other internal systems or holds personally identifiable information (PII) of students or employees. Given the lack of vendor response and patch availability, organizations face an increased window of exposure. The medium severity suggests that while the vulnerability is not critical, it can still facilitate further attacks or data breaches if combined with other weaknesses. European organizations with high reliance on Mentingo for training or educational services should be particularly vigilant, as exploitation could undermine trust and compliance with data protection regulations such as GDPR.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 22 Sep 2025, 00:40 UTC

Technical details

References

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