CWE-204

Observable Response Discrepancy

The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.

CVE-2026-24468 (GCVE-0-2026-24468)

Vulnerability from cvelistv5 – Published: 2026-04-20 15:45 – Updated: 2026-04-20 16:24
VLAI
Title
OpenAEV Vulnerable to Username/Email Enumeration Through Differential HTTP Responses in Password Reset API
Summary
OpenAEV is an open source platform allowing organizations to plan, schedule and conduct cyber adversary simulation campaign and tests. Starting in version 1.11.0 and prior to version 2.0.13, the /api/reset endpoint behaves differently depending on whether the supplied username exists in the system. When a non-existent email is provided in the login parameter, the endpoint returns an HTTP 400 response (Bad Request). When a valid email is supplied, the endpoint responds with HTTP 200. This difference in server responses creates an observable discrepancy that allows an attacker to reliably determine which emails are registered in the application. By automating requests with a list of possible email addresses, an attacker can quickly build a list of valid accounts without any authentication. The endpoint should return a consistent response regardless of whether the username exists in order to prevent account enumeration. Version 2.0.13 fixes this issue.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
OpenAEV-Platform openaev Affected: >= 1.11.0, < 2.0.13
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CVE-2026-24664 (GCVE-0-2026-24664)

Vulnerability from cvelistv5 – Published: 2026-02-03 16:56 – Updated: 2026-02-04 16:52
VLAI
Title
Open eClass is Vulnerable to Username Enumeration via Login Response Discrepancies
Summary
The Open eClass platform (formerly known as GUnet eClass) is a complete course management system. Prior to version 4.2, a username enumeration vulnerability allows unauthenticated attackers to identify valid user accounts by analyzing differences in the login response behavior. This issue has been patched in version 4.2.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
gunet openeclass Affected: < 4.2
Create a notification for this product.
Show details on NVD website
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CVE-2026-25138 (GCVE-0-2026-25138)

Vulnerability from cvelistv5 – Published: 2026-02-25 19:28 – Updated: 2026-02-26 16:03
VLAI
Title
Rucio WebUI has Username Enumeration via Login Error Message
Summary
Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Prior to versions 35.8.3, 38.5.4, and 39.3.1, the WebUI login endpoint returns distinct error messages depending on whether a supplied username exists, allowing unauthenticated attackers to enumerate valid usernames. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
rucio rucio Affected: < 35.8.3
Affected: >= 36.0.0rc1, < 38.5.4
Affected: >= 39.0.0rc1, < 39.3.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-25509 (GCVE-0-2026-25509)

Vulnerability from cvelistv5 – Published: 2026-02-03 21:16 – Updated: 2026-02-04 16:30
VLAI
Title
CI4MS Vulnerable to User Email Enumeration via Password Reset Flow
Summary
CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.28.5.0, the authentication implementation in CI4MS is vulnerable to email enumeration. An unauthenticated attacker can determine whether an email address is registered in the system by analyzing the application's response during the password reset process. This issue has been patched in version 0.28.5.0.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
ci4-cms-erp ci4ms Affected: < 0.28.5.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-27480 (GCVE-0-2026-27480)

Vulnerability from cvelistv5 – Published: 2026-02-21 09:14 – Updated: 2026-02-24 18:13
VLAI
Title
Static Web Server: Timing-Based Username Enumeration in Basic Authentication
Summary
Static Web Server (SWS) is a production-ready web server suitable for static web files or assets. In versions 2.1.0 through 2.40.1, a timing-based username enumeration vulnerability in Basic Authentication allows attackers to identify valid users by exploiting early responses for invalid usernames, enabling targeted brute-force or credential-stuffing attacks. SWS checks whether a username exists before verifying the password, causing valid usernames to follow a slower code path (e.g., bcrypt hashing) while invalid usernames receive an immediate 401 response. This timing discrepancy allows attackers to enumerate valid accounts by measuring response-time differences. This issue has been fixed in version 2.41.0.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
static-web-server static-web-server Affected: >= 2.1.0, < 2.41.0
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CVE-2026-28288 (GCVE-0-2026-28288)

Vulnerability from cvelistv5 – Published: 2026-02-27 20:25 – Updated: 2026-02-27 20:45
VLAI
Title
Dify has a user enumeration issue
Summary
Dify is an open-source LLM app development platform. Prior to 1.9.0, responses from the Dify API to existing and non-existent accounts differ, allowing an attacker to enumerate email addresses registered with Dify. Version 1.9.0 fixes the issue.
Severity
5.5 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
langgenius dify Affected: < 1.9.0
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CVE-2026-28358 (GCVE-0-2026-28358)

Vulnerability from cvelistv5 – Published: 2026-03-02 16:16 – Updated: 2026-03-03 16:02
VLAI
Title
NocoDB: User Enumeration via Password Reset Endpoint
Summary
NocoDB is software for building databases as spreadsheets. Prior to version 0.301.3, the password forgot endpoint returned different responses for registered and unregistered emails, allowing user enumeration. This issue has been patched in version 0.301.3.
Severity
2.7 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
nocodb nocodb Affected: < 0.301.3
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CVE-2026-2859 (GCVE-0-2026-2859)

Vulnerability from cvelistv5 – Published: 2026-03-13 09:40 – Updated: 2026-03-13 15:48
VLAI
Title
Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint
Summary
Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows unauthenticated users to enumerate existing hosts by observing different HTTP response codes in deploy_agent endpoint, which could lead to information disclosure.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
Checkmk GmbH Checkmk Affected: 2.4.0 , < 2.4.0p23 (semver)
Affected: 2.3.0 , < 2.3.0p43 (semver)
Affected: 2.2.0 (semver)
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CVE-2026-30876 (GCVE-0-2026-30876)

Vulnerability from cvelistv5 – Published: 2026-03-16 19:18 – Updated: 2026-03-16 20:22
VLAI
Title
Chamilo LMS: User enumeration vulnerability via response
Summary
Chamilo LMS is a learning management system. Prior to version 1.11.36, Chamilo is vulnerable to user enumeration with valid/invalid username. This issue has been patched in version 1.11.36.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
chamilo chamilo-lms Affected: < 1.11.36
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            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
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              "cweId": "CWE-204",
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          "url": "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-cqr8-vvqp-4mp4"
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        "discovery": "UNKNOWN"
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      "title": "Chamilo LMS: User enumeration vulnerability via response"
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  "cveMetadata": {
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    "cveId": "CVE-2026-30876",
    "datePublished": "2026-03-16T19:18:41.508Z",
    "dateReserved": "2026-03-06T00:04:56.699Z",
    "dateUpdated": "2026-03-16T20:22:42.799Z",
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CVE-2026-31888 (GCVE-0-2026-31888)

Vulnerability from cvelistv5 – Published: 2026-03-11 18:53 – Updated: 2026-03-12 20:02
VLAI
Title
Shopware has user enumeration via distinct error codes on Store API login endpoint
Summary
Shopware is an open commerce platform. Prior to 6.7.8.1 and 6.6.10.15, the Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense. This vulnerability is fixed in 6.7.8.1 and 6.6.10.15.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
shopware core Affected: >= 6.7.0.0, < 6.7.8.1
Affected: < 6.6.10.15
Create a notification for this product.
shopware platform Affected: >= 6.7.0.0, < 6.7.8.1
Affected: < 6.6.10.14
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation ID: MIT-46

Phase: Architecture and Design

Strategy: Separation of Privilege

Description:

  • Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
Mitigation ID: MIT-39

Phase: Implementation

Description:

  • Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
  • If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
  • Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
CAPEC-331: ICMP IP Total Length Field Probe

An adversary sends a UDP packet to a closed port on the target machine to solicit an IP Header's total length field value within the echoed 'Port Unreachable" error message. This type of behavior is useful for building a signature-base of operating system responses, particularly when error messages contain other types of information that is useful identifying specific operating system responses.

CAPEC-332: ICMP IP 'ID' Field Error Message Probe

An adversary sends a UDP datagram having an assigned value to its internet identification field (ID) to a closed port on a target to observe the manner in which this bit is echoed back in the ICMP error message. This allows the attacker to construct a fingerprint of specific OS behaviors.

CAPEC-541: Application Fingerprinting

An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.

CAPEC-580: System Footprinting

An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.

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