Weakness (CWE)
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.
How to prevent it (2 mitigations)
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Architecture and Design
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.
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Implementation
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.
Source: MITRE CWE-204
229 results · Feed
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High 7.3
phpMyFAQ before 4.1.11 and 4.2.0-beta.3 Account Enumeration via WebAuthn prepare-login
phpMyFAQ 4.1.9 before 4.1.11 and 4.2.0 pre-releases before 4.2.0-beta.3 contain an account enumeration vulnerability in the unauthenticated POST /api/webauthn/prepare-login endpoint, which returns stable stored credential IDs for passkey-registered accounts b…
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Medium 4.3
Vikunja before 2.7.1 Information Disclosure via Team Self-Removal Endpoint
Vikunja before 2.7.1 contains an information disclosure vulnerability that allows authenticated users to determine whether private teams exist by calling the team member self-removal endpoint. Attackers can send DELETE requests to /teams/{id}/members/{own use…
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Medium 5.3
Multiple Vulnerabilities in IBM API Connect
IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote attacker to enumerate usernames due to observable differences in response behavior.
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Medium 6.9
SuiteCRM: V8 OAuth2 Username Enumeration
SuiteCRM is an open-source, enterprise-ready Customer Relationship Management (CRM) software application. Prior to 7.15.2 and 8.10.2, the /legacy/Api/V8/OAuth2 password-grant endpoint returns distinct error messages for an invalid username and an invalid pass…
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Low 3.7
HomeBox: Timing Side-Channel in Login Endpoint Allows User Enumeration via Bcrypt Hashing Delay
HomeBox is a home inventory and organization system. Prior to 0.27.0, the POST /api/v1/users/login endpoint performs password-hash verification only when the submitted username matches an existing account, while unknown usernames return immediately. Although …
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Medium 5.3
Open edX: Support "manage_course_team" REST API omits the `require_support_permission` gate its sibling support views enforce
Open edX Platform enables the authoring and delivery of online learning at any scale. From the Ulmo release until release/ulmo.4 and release/verawood.1, the GET /api/support/v1/manage_course_team/ endpoint in CourseTeamManageAPIView requires only IsAuthentica…
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Medium 5.3
blueprintUE Self-Hosted Edition before 4.3.3 Account Enumeration via Password Reset
blueprintUE Self-Hosted Edition before 4.3.3 contains an account enumeration vulnerability in ForgotPasswordMiddleware.php that allows unauthenticated attackers to identify registered email addresses. Attackers can compare password reset redirect targets for …
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Medium 5.3
WPGraphQL before 2.24.2 Object Existence Disclosure via Media and Comment Mutations
WPGraphQL before 2.24.2 contains an information disclosure vulnerability that allows unauthenticated attackers to determine object existence through distinct error responses. Attackers can iterate IDs against deleteMediaItem, updateMediaItem, deleteComment an…
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High 7.5
User Enumeration in Rolantis Information Technologies' Agentis
Observable response discrepancy vulnerability in Rolantis Information Technologies Tourism Industry and Trade Co. Ltd. Agentis allows Account Footprinting. This issue affects Agentis: before 4.8.
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Medium 5.3
Cacti: User Enumeration via Error Messages
Cacti is an open source performance and fault management framework. Prior to version 1.2.31, a User Enumeration vulnerability allows an attacker to identify valid usernames on the Cacti service. When a user attempts to log in, the application returns slightly…
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Medium 5.8
Username Enumeration via External User Stores in Multiple WSO2 Products Allows User Account Discovery
When a WSO2 product is configured to use an external user store, the system fails to adequately obscure the existence or validity of usernames during authentication attempts. This oversight allows an attacker to repeatedly query the authentication mechanism w…
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Medium 6.9
FOSSBilling: Unauthenticated client account enumeration via guest signup endpoint
FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct u…
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Low 3.7
Coder before 2.34.2 User Enumeration via Login Placeholder Hash
Coder before 2.29.17, 2.30.0 before 2.32.7, 2.33.0 before 2.33.8, and 2.34.0 before 2.34.2 contains a user enumeration vulnerability because userpassword.Compare() substitutes a placeholder hash derived from the string "hunter2" when a stored password hash is…
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Medium 5.3
phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta Account Enumeration via Guest Comment Endpoint
phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta contains an account enumeration vulnerability that allows unauthenticated attackers to confirm registered display names and emails via a distinct HTTP 409 response. Attackers can submit guest comments to…
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Medium 5.3
Guangzhou Juan IoT Technology EseeCloud Observable Response Discrepancy
The endpoint exposes an observable response discrepancy when processing ID values. A request submitted with a nonexistent ID returns a distinct error response code from one submitted with a valid, registered ID, allowing an attacker holding a valid access tok…
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High 7.5
User Enumeration via Password Reset in IKAS Technology Inc.'s ikas E-Commerce Infrastructure
Observable response discrepancy vulnerability in IKAS Technology Inc. Ikas E-Commerce Infrastructure allows Account Footprinting. This issue affects ikas E-Commerce Infrastructure: through 2026-07-13.
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Medium 4.3
Nezha 1.7.0 before 2.3.15 Cross-Tenant Server-ID Enumeration via getServerConfig
Nezha from 1.7.0 before 2.3.15 contains an information disclosure vulnerability that allows authenticated members to enumerate other tenants' server IDs through differential responses. Attackers can sweep sequential IDs against getServerConfig and setServerCo…
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Critical 9.1
OpenNMS REST authorization bypass via non-canonical HTTP method
An authorization bypass vulnerability exists in the REST API of multiple versions of OpenNMS Meridian and Horizon. The /rest/** Spring Security filter chains authorize requests with intercept-url rules that name the HTTP method as an uppercase token, compare …
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Medium 5.3
RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET
A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack…
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Low 3.7
CVE-2026-103526
In Thelia v2.6.0, both the administrative login and forgotten password endpoints return different responses for invalid usernames and incorrect passwords, allowing unauthenticated attackers to enumerate valid administrator accounts. Because the endpoint also …
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Medium 5.3
LogicalDOC Community Edition through 9.3 Username Enumeration via AvatarServlet
LogicalDOC Community Edition through 9.3 contains a username enumeration vulnerability that allows unauthenticated attackers to identify valid accounts because the AvatarServlet (/avatar) performs no session validation. Attackers can supply usernames or numer…
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Medium 5.3
Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha check
Contao is an Open Source CMS. From version 4.1.0 until 5.3.50 and 5.7.12, ModuleRegistration::compile() enters its follow-up registration branch on any POST to a page containing the registration module without verifying FORM_SUBMIT or the preceding captcha re…
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Medium 5.1
Hidden host credentials inferable via multiselect.get filtering
Host search in Frontend allows filtering by fields that are not displayed, including stored IPMI and PSK credentials. A user with read access can guess a credential and see from the search result whether the guess was right, letting them uncover it.
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Medium 5.3
UTMStack < 11.2.16 Account Enumeration via Password Reset Endpoint
UTMStack before 11.2.16 contains an account enumeration vulnerability that allows unauthenticated attackers to determine registered email addresses by observing differing HTTP responses from the POST /api/account/reset-password/init endpoint. Attackers can su…
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Medium 5.3
YesWiki before 4.6.7 User Enumeration via Lost-Password Flow
YesWiki before 4.6.7 contains a user enumeration vulnerability in LostPasswordAction.php that allows unauthenticated attackers to confirm registered email addresses through differing responses. Attackers can submit emails to the MotDePassePerdu recovery page …
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Medium 5.3
Username Enumeration in Maksisoft Technology's Maksisoft Gym
Observable response discrepancy vulnerability in Maksisoft Technology, IT, and Software Industry and Trade Inc. Maksisoft Gym allows Account Footprinting. This issue affects Maksisoft Gym: from 0.5.10 before 0.5.11.
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Low 2.7
Moodle: user list filters bypass profile field visibility
A flaw was found in Moodle. User list filters do not properly enforce visibility restrictions on user profile fields. An authorized user with manager privileges can filter user lists using profile attributes they are not permitted to view directly, resulting …
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Medium 5.3
Automation-controller: automation-controller: unauthenticated 200-vs-403 oracle in bitbucket data center webhook receiver enumerates webhook-enabled job templates
A flaw was found in the Ansible Automation Platform automation-controller. The unauthenticated Bitbucket Data Center webhook receiver skips HMAC signature verification for diagnostics:ping events after it has already looked up the target template, causing the…
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Medium 4.1
Automation-controller: automation-controller-container: automation-controller: custom_venv_path setting provides filesystem path-existence oracle on control pod
StringListPathField.to_internal_value() calls os.path.exists() on unbounded user-supplied paths. 200 vs 400 response reveals existence of arbitrary absolute paths on the controller-web pod. Tenant superuser can confirm /etc/tower/SECRET_KEY, k8s service-accou…
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Medium 5.0
Automation-controller: automation-controller-container: automation-controller: named-url 404 body oracle enables cross-tenant resource name enumeration
URLModificationMiddleware resolves named-URL lookups against unfiltered Model.objects before RBAC. The 403→404 shim only rewrites 403 responses, leaving the pk=0 miss path with a different 404 detail string. Differential "Not found." vs "No <Model> matches...…
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Medium 5.3
Kingdom Communication Associated｜Smart Video Intercom System - Sensitive Data Exposure
Smart Video Intercom System developed by Kingdom Communication Associated has a Sensitive Data Exposure vulnerability. Unauthenticated remote attackers can enumerate valid user accounts by exploiting differences in system responses.
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Medium 5.3
User Enumeration in DernekPlus' Website Template
Observable response discrepancy vulnerability in DernekPlus Website Template allows Account Footprinting. This issue affects Website Template: through 10092026. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Medium 6.5
Snipe-IT before 8.7.0 License Key Exposure via CSV Export
Snipe-IT before 8.7.0 fails to properly enforce the viewKeys authorization gate in CSV export and API index endpoints, allowing authenticated users with only licenses.view permission to access product keys. Attackers can download all license keys in bulk via …
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High 7.5
User Enumeration in GastroMenum's GastroMenum Web Panel
Observable response discrepancy vulnerability in GastroMenum GastroMenum Web Panel allows Account Footprinting. This issue affects GastroMenum Web Panel: before 31.08.2026.
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High 7.5
Username Enumeration in Menulux Software's Menulux Portal
Observable response discrepancy vulnerability in Menulux Software Inc. Menulux Portal allows Account Footprinting. This issue affects Menulux Portal: before 20260903211448.
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Medium 4.3
Observable Response Discrepancy in Kibana Leading to Cross-Space Information Disclosure
Observable Response Discrepancy (CWE-204) in the Kibana Osquery feature can lead to information disclosure via Query System for Information (CAPEC-54). An authenticated user holding Osquery live-query privileges could determine whether a scheduled query ident…
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Low 3.7
Filament: Password validity disclosure for accounts denied panel access on login page
Filament is a collection of full-stack components for accelerated Laravel development. From 4.0.0 until 4.12.5 and 5.7.5, packages/panels/src/Auth/Pages/Login.php presents the multi-factor authentication challenge before evaluating canAccessPanel(). For an ac…
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Medium 5.3
Automatisch through 0.15.0 User Enumeration via Forgot-Password Response Discrepancy
Automatisch reveals whether an address is registered through the response to its forgot-password request. The controller at packages/backend/src/controllers/internal/api/v1/users/forgot-password.js looks the address up and chains a not-found throw onto the qu…
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Medium 5.3
Rocket.Chat Missing DDP Rate Limit on the sendForgotPasswordEmail Meteor Method
Rocket.Chat exposes the sendForgotPasswordEmail Meteor method without a DDP rate limit, so an unauthenticated caller may invoke it as often as it likes. The method is reachable over DDP and over the HTTP route POST /api/v1/method.callAnon/sendForgotPasswordEm…
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High 7.5
Combodo iTop: User enumeration via password reset
Combodo iTop is a web based IT service management tool. Prior to 3.2.3, iTop returns different responses for valid/invalid usernames depending on multiple factors in the reset password mechanism, leading to user enumeration. This issue has been fixed in versi…