Common Weakness Enumeration

CWE-203

Allowed

Observable Discrepancy

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

885 vulnerabilities reference this CWE, most recent first.

CVE-2026-45410 (GCVE-0-2026-45410)

Vulnerability from cvelistv5 – Published: 2026-05-28 21:23 – Updated: 2026-05-29 14:46
VLAI
Title
Time-based user enumeration in TREK authentication endpoint
Summary
TREK is a collaborative travel planner. Prior to 3.0.18, early return on missing user during login flow allowed an attacker to enumerate valid user accounts via response timing discrepancy. When an email address existed in the database, the backend performed a bcrypt password comparison before returning a 401 Unauthorized, adding ~370 ms of latency. When the email did not exist, the backend returned immediately (~10 ms). This ~14× timing difference could be detected without any difference in HTTP status codes or response bodies. This vulnerability is fixed in 3.0.18.
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 2026-05-29 14:46 UTC
CWE
  • CWE-203 - Observable Discrepancy
  • CWE-208 - Observable Timing Discrepancy
Assigner
References
Impacted products
Vendor Product Version
mauriceboe TREK Affected: < 3.0.18
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CVE-2026-45294 (GCVE-0-2026-45294)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:52 – Updated: 2026-06-02 01:56
VLAI
Title
FreeScout: User Account Enumeration via Password Reset Response Differentiation
Summary
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to 1.8.219, the password reset endpoint returns visually distinct responses depending on whether the submitted email address belongs to an existing user account, allowing unauthenticated attackers to enumerate valid helpdesk agent email addresses. This vulnerability is fixed in 1.8.219.
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 2026-06-02 01:55 UTC
CWE
  • CWE-203 - Observable Discrepancy
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-44332 (GCVE-0-2026-44332)

Vulnerability from cvelistv5 – Published: 2026-07-08 19:32 – Updated: 2026-07-09 14:33
VLAI
Title
Fiber: Username Enumeration via Timing Oracle in BasicAuth Default Authorizer
Summary
Fiber is an Express inspired web framework written in Go. Prior to 3.3.0, the default Authorizer function in the BasicAuth middleware in middleware/basicauth/config.go uses short-circuit evaluation that skips password hash comparison for non-existent usernames, enabling reliable remote username enumeration through response timing differences. This issue is fixed in version 3.3.0.
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: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 14:33 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
gofiber fiber Affected: < 3.3.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-44263 (GCVE-0-2026-44263)

Vulnerability from cvelistv5 – Published: 2026-05-07 13:42 – Updated: 2026-05-07 15:02
VLAI
Title
Weblate: Private Translation Enumeration via Screenshot API
Summary
Weblate is a web based localization tool. Prior to version 5.17.1, the screenshots, tasks, and component link API allowed for the enumeration of translations in a project inaccessible to the user. This issue has been patched in version 5.17.1.
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 2026-05-07 14:59 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
WeblateOrg weblate Affected: < 5.17.1
Create a notification for this product.
Show details on NVD website
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CVE-2026-33429 (GCVE-0-2026-33429)

Vulnerability from cvelistv5 – Published: 2026-03-24 18:16 – Updated: 2026-03-25 13:34
VLAI
Title
Parse Server: Protected field change detection oracle via LiveQuery watch parameter
Summary
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43.
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-03-25 13:33 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
parse-community parse-server Affected: < 8.6.54
Affected: >= 9.0.0, < 9.6.0-alpha.43
Create a notification for this product.
Show details on NVD website
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CVE-2026-33425 (GCVE-0-2026-33425)

Vulnerability from cvelistv5 – Published: 2026-03-20 23:12 – Updated: 2026-03-23 16:48
VLAI
Title
Discourse has inferable private group membership or existence via exclude_groups parameter
Summary
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the `exclude_groups` parameter. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.
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: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-23 16:48 UTC
CWE
  • CWE-203 - Observable Discrepancy
  • CWE-639 - Authorization Bypass Through User-Controlled Key
  • CWE-862 - Missing Authorization
Assigner
References
Impacted products
Vendor Product Version
discourse discourse Affected: >= 2026.1.0-latest, < 2026.1.2
Affected: >= 2026.2.0-latest, < 2026.2.1
Affected: = 2026.3.0-latest
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CVE-2026-28490 (GCVE-0-2026-28490)

Vulnerability from cvelistv5 – Published: 2026-03-16 17:37 – Updated: 2026-03-16 18:17
VLAI
Title
Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle
Summary
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-16 18:17 UTC
CWE
  • CWE-203 - Observable Discrepancy
  • CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
Assigner
References
Impacted products
Vendor Product Version
authlib authlib Affected: < 1.6.9
Create a notification for this product.
Show details on NVD website
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CVE-2026-26315 (GCVE-0-2026-26315)

Vulnerability from cvelistv5 – Published: 2026-02-19 21:22 – Updated: 2026-02-20 15:42
VLAI
Title
Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake
Summary
go-ethereum (Geth) is a golang execution layer implementation of the Ethereum protocol. Prior to version 1.16.9, through a flaw in the ECIES cryptography implementation, an attacker may be able to extract bits of the p2p node key. The issue is resolved in the v1.16.9 and v1.17.0 releases of Geth. Geth maintainers recommend rotating the node key after applying the upgrade, which can be done by removing the file `<datadir>/geth/nodekey` before starting Geth.
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 2026-02-20 15:32 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
ethereum go-ethereum Affected: < 1.16.9
Create a notification for this product.
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CVE-2026-26185 (GCVE-0-2026-26185)

Vulnerability from cvelistv5 – Published: 2026-02-12 21:54 – Updated: 2026-02-13 15:59
VLAI
Title
Directus Affected by User Enumeration via Password Reset Timing Attack
Summary
Directus is a real-time API and App dashboard for managing SQL database content. Before 11.14.1, a timing-based user enumeration vulnerability exists in the password reset functionality. When an invalid reset_url parameter is provided, the response time differs by approximately 500ms between existing and non-existing users, enabling reliable user enumeration. This vulnerability is fixed in 11.14.1.
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 2026-02-13 15:58 UTC
CWE
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-25562 (GCVE-0-2026-25562)

Vulnerability from cvelistv5 – Published: 2026-02-07 21:57 – Updated: 2026-07-14 15:53
VLAI
Title
WeKan < 8.19 Attachments Publication Information Disclosure
Summary
WeKan versions prior to 8.19 contain an information disclosure vulnerability in the attachments publication. Attachment metadata can be returned without properly scoping results to boards and cards accessible to the requesting user, potentially exposing attachment metadata to unauthorized users.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 2026-02-10 16:22 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
WeKan WeKan Affected: 0 , < 8.19 (custom)
    cpe:2.3:a:wekan_project:wekan:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Joshua Rogers
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-189: Black Box Reverse Engineering

An adversary discovers the structure, function, and composition of a type of computer software through black box analysis techniques. 'Black Box' methods involve interacting with the software indirectly, in the absence of direct access to the executable object. Such analysis typically involves interacting with the software at the boundaries of where the software interfaces with a larger execution environment, such as input-output vectors, libraries, or APIs. Black Box Reverse Engineering also refers to gathering physical side effects of a hardware device, such as electromagnetic radiation or sounds.

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