GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration
Common Weakness Enumeration

CWE-204

Allowed

Observable Response Discrepancy

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

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.

341 vulnerabilities reference this CWE, most recent first.

CVE-2026-89173 (GCVE-0-2026-89173)

Vulnerability from cvelistv5 – Published: 2026-09-11 07:27 – Updated: 2026-09-11 16:18
VLAI
Title
Kingdom Communication Associated｜Smart Video Intercom System - Sensitive Data Exposure
Summary
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.
Severity
6.9 (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
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 16:18 UTC
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Assigner
References
Impacted products
Date Public
2026-09-11 07:23
Show details on NVD website
To clipboard 

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CVE-2026-86758 (GCVE-0-2026-86758)

Vulnerability from cvelistv5 – Published: 2026-09-09 13:32 – Updated: 2026-09-09 14:29
VLAI
Title
Snipe-IT before 8.7.0 License Key Exposure via CSV Export
Summary
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 CSV export or validate candidate keys through API response discrepancies without needing the viewKeys permission.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 14:28 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
grokability snipe-it Affected: 0 , < 8.7.0 (semver)
Unaffected: 8.7.0 (semver)
    cpe:2.3:a:snipeitapp:snipe-it:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-24 00:00
Credits
pavelkohout396
Show details on NVD website
To clipboard 

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CVE-2026-84307 (GCVE-0-2026-84307)

Vulnerability from cvelistv5 – Published: 2026-09-01 19:13 – Updated: 2026-09-02 16:02
VLAI
Title
Filament: Password validity disclosure for accounts denied panel access on login page
Summary
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 account that canAccessPanel() denies, submitting the correct password renders the MFA challenge while an incorrect password returns the generic authentication failure, allowing an unauthenticated attacker to confirm whether a candidate password is valid for that account. When email-based MFA is configured, the correct-password path also sends a login code to the account holder. The issue applies only to accounts that have MFA enabled and are denied panel access. Authentication is not bypassed because canAccessPanel() still runs after the challenge, and no session is created. This issue is fixed in versions 4.12.5 and 5.7.5.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:42 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
filamentphp filament Affected: >= 4.0.0, < 4.12.5
Affected: >= 5.0.0, < 5.7.5
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-81033 (GCVE-0-2026-81033)

Vulnerability from cvelistv5 – Published: 2026-08-26 15:45 – Updated: 2026-08-28 16:00
VLAI
Title
Automatisch through 0.15.0 User Enumeration via Forgot-Password Response Discrepancy
Summary
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 query, so an address with no account raises an error that the global handler renders as a not-found status, while a registered address proceeds to send the reset message and returns no-content. The route is mounted without authentication. Submitting candidate addresses and comparing the two status codes therefore establishes which addresses hold accounts, with no credential and no rate limiting in the path.
Severity
6.9 (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
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 18:38 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
automatisch automatisch Affected: 0 , ≤ 0.15.0 (semver)
Create a notification for this product.
Date Public
2026-08-26 00:00
Credits
George Chen
Show details on NVD website
To clipboard 

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CVE-2026-78584 (GCVE-0-2026-78584)

Vulnerability from cvelistv5 – Published: 2026-09-02 14:43 – Updated: 2026-09-02 15:58
VLAI
Title
Observable Response Discrepancy in Kibana Leading to Cross-Space Information Disclosure
Summary
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 identifier exists in a Kibana space they are not authorized to access.
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 15:45 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
Elastic Kibana Affected: 9.4.0 , ≤ 9.4.3 (semver)
Create a notification for this product.
Show details on NVD website
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CVE-2026-75575 (GCVE-0-2026-75575)

Vulnerability from cvelistv5 – Published: 2026-08-25 01:30 – Updated: 2026-08-29 11:47
VLAI
Title
Rocket.Chat Missing DDP Rate Limit on the sendForgotPasswordEmail Meteor Method
Summary
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/sendForgotPasswordEmail, and it triggers a password reset message for any address that matches an account. With no DDPRateLimiter rule registered for it, a caller can drive an unbounded volume of reset mail at a chosen address from the deployment's own mail sender, and can probe addresses at scale: the method answers true for an address with no account and for a successful send, but false when the address belongs to an account that authenticates through an external provider and Accounts_AllowPasswordChangeForOAuthUsers is off, so repeated calls distinguish that class of account. Later versions register a rule permitting ten calls per minute per client address.
Severity
6.9 (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
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 15:25 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
RocketChat Rocket.Chat Affected: 0 , < 7.10.15 (semver)
Affected: 8.0.0 , < 8.1.8 (semver)
Affected: 8.2.0 , < 8.2.8 (semver)
Affected: 8.3.0 , < 8.3.8 (semver)
Affected: 8.4.0 , < 8.4.6 (semver)
Affected: 8.5.0 , < 8.5.3 (semver)
Affected: 8.6.0 , < 8.6.2 (semver)
Affected: 8.7.0 , < 8.7.2 (semver)
Affected: 8.8.0-rc.0 , < 8.8.0 (semver)
    cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*
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Create a notification for this product.
Date Public
2026-08-20 00:00
Credits
nedlir
Show details on NVD website
To clipboard 

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CVE-2026-73306 (GCVE-0-2026-73306)

Vulnerability from cvelistv5 – Published: 2026-08-12 18:56 – Updated: 2026-08-13 12:18
VLAI
Title
Budibase: Account Enumeration via Login Lockout Response Differential
Summary
Budibase is an open-source low-code platform. Prior to 3.39.25, POST /api/global/auth/:tenantId/login incremented the failure counter in packages/worker/src/api/controllers/global/auth.ts only for existing users, while packages/worker/src/middleware/emailLockout.ts returned X-Account-Locked and Retry-After only for locked identifiers. An unauthenticated attacker could compare the response after repeated failures to enumerate valid email addresses and temporarily lock valid accounts. This issue is fixed in version 3.39.25.
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 12:18 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
Budibase budibase Affected: < 3.39.25
Create a notification for this product.
Show details on NVD website
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CVE-2026-72588 (GCVE-0-2026-72588)

Vulnerability from cvelistv5 – Published: 2026-08-10 10:41 – Updated: 2026-08-10 13:22
VLAI
Title
bluewave-labs Checkmate - User Enumeration via Differential HTTP Response in Password Recovery
Summary
A user enumeration vulnerability in bluewave-labs/Checkmate through 2.1.0 allows an unauthenticated remote attacker to determine whether a given email address is registered. The POST /api/v1/auth/recovery/request endpoint returns HTTP 200 for registered email addresses and a different status code for unregistered ones, enabling attackers to enumerate valid user accounts.
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 13:22 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
URL Tags
https://github.com/bluewave-labs/Checkmate third-party-advisory
Impacted products
Vendor Product Version
bluewave-labs Checkmate Affected: 0 , ≤ 2.1.0 (semver)
Create a notification for this product.
Date Public
2026-08-10 10:32
Credits
Kamron Rasuljonov
Show details on NVD website
To clipboard 

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CVE-2026-69519 (GCVE-0-2026-69519)

Vulnerability from cvelistv5 – Published: 2026-08-20 21:43 – Updated: 2026-09-11 16:46 Exclusively Hosted Service
VLAI
Title
Azure Stack HCI Information Disclosure Vulnerability
Summary
Observable response discrepancy in Azure Stack HCI allows an unauthorized attacker to disclose information over a network.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 12:42 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
Microsoft Azure Stack HCI Affected: -
    cpe:2.3:a:microsoft:azure_stack_hci:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-20 14:00
Show details on NVD website
To clipboard 

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CVE-2026-66002 (GCVE-0-2026-66002)

Vulnerability from cvelistv5 – Published: 2026-08-20 18:29 – Updated: 2026-08-21 21:46
VLAI
Title
Frappe: User Enumeration via PDDR
Summary
Frappe is a full-stack web application framework. Prior to 15.115.0 and 16.27.0, the public request-data web form and PersonalDataDownloadRequest class in frappe/website/doctype/personal_data_download_request/personal_data_download_request.py return distinguishable response shapes for registered and unregistered email addresses, including the user_name field and persistence behavior. A remote attacker can compare the responses to enumerate registered users. This issue is fixed in versions 15.115.0 and 16.27.0.
Severity
6.9 (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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 21:09 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
frappe frappe Affected: < 15.115.0
Affected: >= 16.0.0-beta.1, < 16.27.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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            "x_refsource_MISC"
          ],
          "url": "https://github.com/frappe/frappe/commit/47a396ec59f5362029feb349eb2b9d10a21afcf8"
        },
        {
          "name": "https://github.com/frappe/frappe/commit/4b32a4e0072e61ce0abcb0d09cfd1f14724fe896",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/frappe/frappe/commit/4b32a4e0072e61ce0abcb0d09cfd1f14724fe896"
        },
        {
          "name": "https://github.com/frappe/frappe/releases/tag/v15.115.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/frappe/frappe/releases/tag/v15.115.0"
        },
        {
          "name": "https://github.com/frappe/frappe/releases/tag/v16.27.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/frappe/frappe/releases/tag/v16.27.0"
        }
      ],
      "source": {
        "advisory": "GHSA-c2xv-c53h-qvr5",
        "discovery": "UNKNOWN"
      },
      "title": "Frappe: User Enumeration via PDDR"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-66002",
    "datePublished": "2026-08-20T18:29:40.872Z",
    "dateReserved": "2026-07-23T18:54:15.833Z",
    "dateUpdated": "2026-08-21T21:46:12.905Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}
Mitigation MIT-46
Architecture and Design

Strategy: Separation of Privilege

  • 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 MIT-39
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.
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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