CVE-2025-15134VulnerabilityPublished 28 Dec 2025Updated 29 Dec 2025

CVE-2025-15134: yourmaileyes MOOC · Cross Site Scripting

Affects yourmaileyes MOOCSource CVE Database V5

Not known to be exploited · CVSS 5.1 Medium.

Data as of 25 Oct 2026, 19:02 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 14% 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 28 Dec 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 2026-10-25.

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
GitHubyourmaileyes/MOOC`pkg:github/yourmaileyes/MOOC`Other threats	Affected =1.0 =1.1 =1.2 =1.3 =1.4 =1.5 =1.6 =1.7 =1.8 =1.9 =1.10 =1.11 =1.12 =1.13 =1.14 =1.15 =1.16 =1.17	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

2) Enforce strict input validation and output encoding on all user-supplied data, especially the 'review' argument, to neutralize script injection attempts. 3) Educate users to avoid clicking suspicious links or submitting untrusted input related to the MOOC platform. 4) Monitor web server logs and application behavior for unusual requests or error patterns indicative of exploitation attempts. 5) Isolate the MOOC platform within a segmented network zone to limit lateral movement if compromise occurs. 6) Consider temporary disabling or restricting the vulnerable functionality if feasible until a patch is released. 7) Engage with the vendor or community to track patch developments and apply updates promptly once available. 8) Implement Content Security Policy (CSP) headers to reduce the impact of XSS by restricting script execution sources.

Description

A security flaw has been discovered in yourmaileyes MOOC up to 1.17. This affects the function subreview of the file mooc/controller/MainController.java of the component Submission Handler. Performing manipulation of the argument review results in cross site scripting. The attack can be initiated remotely. The exploit has been released to the public and may be exploited. The project was informed of the problem early through an issue report but has not responded yet.

Impact

For European organizations, this XSS vulnerability poses significant risks, especially for educational institutions, training providers, and enterprises using yourmaileyes MOOC for managing coursework and submissions. Exploitation could lead to theft of user credentials, session hijacking, unauthorized access to sensitive educational data, and manipulation or defacement of course content. This could damage institutional reputation, violate data protection regulations such as GDPR, and disrupt learning activities. Additionally, attackers could leverage the XSS flaw as a pivot point for further attacks within the organization's network. The public availability of exploit code increases the likelihood of opportunistic attacks, particularly targeting less security-aware users. The lack of vendor response and patch availability prolongs exposure, necessitating immediate mitigation efforts by affected organizations.

References

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