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.

323 vulnerabilities reference this CWE, most recent first.

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

Vulnerability from cvelistv5 – Published: 2026-08-20 21:43 – Updated: 2026-08-24 16:06 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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CVE-2026-61503 (GCVE-0-2026-61503)

Vulnerability from cvelistv5 – Published: 2026-07-13 17:23 – Updated: 2026-07-15 19:07 X_Open Source
VLAI
Title
Rejetto HFS < 3.2.1 Username Enumeration via Login Response Differences
Summary
Rejetto HFS 3.0.0 through 3.2.0 returns observably different responses from its login endpoint depending on whether the submitted username exists. A remote unauthenticated attacker can use this to confirm valid account names, including the default admin account, facilitating password-guessing and session-forgery attacks.
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 2026-07-15 19:07 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
rejetto hfs Affected: 3.0.0 , < 3.2.1 (semver)
Create a notification for this product.
Date Public
2026-07-13 00:00
Credits
Zach Hanley (@hacks_zach) of Horizon3.ai, in collaboration with Claude and Anthropic Research
Show details on NVD website
To clipboard 

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CVE-2026-60007 (GCVE-0-2026-60007)

Vulnerability from cvelistv5 – Published: 2026-08-04 11:55 – Updated: 2026-08-04 15:02
VLAI
Summary
In Eclipse Milo versions 0.6.0 through 1.1.4, username-token processing returns distinguishable errors for invalid RSA PKCS#1 v1.5 padding and other authentication failures, allowing an on-path attacker who captures a victim's `Basic128Rsa15`-encrypted username token to use repeated unauthenticated `ActivateSession` requests as a padding oracle, recover the victim's password, and authenticate with the recovered credentials.
Severity
9.1 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 14:19 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse Milo Affected: 0.6.0 , ≤ 1.1.4 (semver)
Create a notification for this product.
Credits
Abhinav Agarwal (GitHub: @abhinavagarwal07)
Show details on NVD website
To clipboard 

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CVE-2026-55998 (GCVE-0-2026-55998)

Vulnerability from cvelistv5 – Published: 2026-08-05 07:51 – Updated: 2026-08-05 13:13
VLAI
Title
Cluster Existence Oracle via Unauthenticated Import Endpoint
Summary
The endpoint /v3/import/{token}_{clusterId}.yaml retrieves the cluster object before validating the token. When a valid cluster ID references a cluster that has private registry secrets configured, a nil pointer dereference in pkg/systemtemplate/private_registry.go causes the request to return HTTP 502 Bad Gateway. For cluster IDs that do not exist, the endpoint returns HTTP 200. This observable difference in response codes constitutes a reliable enumeration oracle.
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 2026-08-05 13:11 UTC
CWE
  • CWE-204 - Observable response discrepancy
Assigner
References
Impacted products
Vendor Product Version
SUSE Rancher Affected: 2.14.0 , < 2.14.4 (semver)
Affected: 2.13.0 , < 2.13.8 (semver)
Affected: 2.12.0 , < 2.12.12 (semver)
Affected: 2.11.0 , < 2.11.16 (semver)
Create a notification for this product.
Credits
This vulnerability was discovered and reported by Michael Wollner (@ibonok) from Deutsche Telekom AG.
Show details on NVD website
To clipboard 

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CVE-2026-54768 (GCVE-0-2026-54768)

Vulnerability from cvelistv5 – Published: 2026-07-31 22:24 – Updated: 2026-08-03 20:36
VLAI
Title
WPGraphQL has deprecated `user` field on SendPasswordResetEmailPayload that leaks user existence + profile (defeats explicit anti-enumeration design)
Summary
WPGraphQL provides a GraphQL API for WordPress sites. From 2.0.0 until 2.15.1, the deprecated user field on SendPasswordResetEmailPayload lets an unauthenticated caller distinguish existing author-class accounts through the sendPasswordResetEmail mutation and obtain public profile fields. This issue is fixed in version 2.15.1.
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: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 20:36 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
wp-graphql wp-graphql Affected: < 2.15.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-54739 (GCVE-0-2026-54739)

Vulnerability from cvelistv5 – Published: 2026-08-19 20:16 – Updated: 2026-08-21 21:48
VLAI
Title
Lemmy: Login Endpoint User Enumeration via HTTP Response Code Differential
Summary
Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-beta.1, Lemmy's login endpoint in crates/api/api/src/local_user/login.rs returns different errors depending on whether the username_or_email value exists. LocalUserView::find_by_email_or_name propagates a NotFound response for an unknown account, while an existing account with a wrong password returns LemmyErrorType::IncorrectLogin. This observable response discrepancy, including HTTP 404 for a nonexistent account and HTTP 400 for an incorrect password on an existing account, allows an unauthenticated attacker to confirm registered usernames or email addresses and use the results for targeted credential attacks or social engineering. This issue is fixed in versions 0.19.19 and 1.0.0-beta.1.
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
LemmyNet lemmy Affected: < 0.19.19
Affected: >= 1.0.0-alpha.0, < 1.0.0-beta.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-54445 (GCVE-0-2026-54445)

Vulnerability from cvelistv5 – Published: 2026-06-17 22:14 – Updated: 2026-06-18 15:49
VLAI
Title
Vantage6: Set admin user and password from environment or configuration
Summary
vantage6 is an open-source infrastructure for privacy preserving analysis. Versions prior to 5.0.0 provide an initial user with username `root` and password `root`. This is not ideal because attackers know that almost all vantage6 servers have a user with username `root` that probably has admin rights, and the initial password is very weak and it is possible that administrators forget to reset it. Version 5.0.0 fixes the issue. As a workaround, it is possible to delete the `root` user after it has been used to create other users.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 15:49 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
  • CWE-1393 - Use of Default Password
Assigner
References
Impacted products
Vendor Product Version
vantage6 vantage6 Affected: < 5.0.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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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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