CWE-203
Observable Discrepancy
Description
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
Hierarchy (View 1000)
Related attack patterns (CAPEC)
CAPEC-189
CVEs mapped to this weakness (762)
page 28 of 39| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2021-34576 | Med | 0.28 | 4.3 | 0.00 | Sep 16, 2021 | In Kaden PICOFLUX Air in all known versions an information exposure through observable discrepancy exists. This may give sensitive information (water consumption without distinct values) to third parties. | ||
| CVE-2016-20012 | Med | 0.28 | 5.3 | 0.05 | Sep 15, 2021 | OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a… | ||
| CVE-2020-36422 | Med | 0.28 | 5.3 | 0.01 | Jul 19, 2021 | An issue was discovered in Arm Mbed TLS before 2.23.0. A side channel allows recovery of an ECC private key, related to mbedtls_ecp_check_pub_priv, mbedtls_pk_parse_key, mbedtls_pk_parse_keyfile, mbedtls_ecp_mul, and mbedtls_ecp_mul_restartable. | ||
| CVE-2020-36421 | Med | 0.28 | 5.3 | 0.02 | Jul 19, 2021 | An issue was discovered in Arm Mbed TLS before 2.23.0. Because of a side channel in modular exponentiation, an RSA private key used in a secure enclave could be disclosed. | ||
| CVE-2021-29621 | Med | 0.28 | 5.3 | 0.03 | Jun 7, 2021 | Flask-AppBuilder is a development framework, built on top of Flask. User enumeration in database authentication in Flask-AppBuilder <= 3.2.3. Allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in.… | ||
| CVE-2021-21424 | Med | 0.28 | 5.3 | 0.02 | May 13, 2021 | Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch… | ||
| CVE-2020-26939 | Med | 0.28 | 5.3 | 0.01 | Nov 2, 2020 | In Legion of the Bouncy Castle BC before 1.61 and BC-FJA before 1.0.1.2, attackers can obtain sensitive information about a private exponent because of Observable Differences in Behavior to Error Inputs. This occurs in org.bouncycastle.crypto.encodings.OAEPEncoding. Sending… | ||
| CVE-2020-6531 | Med | 0.28 | 4.3 | 0.02 | Jul 22, 2020 | Side-channel information leakage in scroll to text in Google Chrome prior to 84.0.4147.89 allowed a remote attacker to leak cross-origin data via a crafted HTML page. | ||
| CVE-2020-11576 | Med | 0.28 | 5.3 | 0.02 | Apr 8, 2020 | Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise. | ||
| CVE-2020-2102 | Med | 0.28 | 5.3 | 0.01 | Jan 29, 2020 | Jenkins 2.218 and earlier, LTS 2.204.1 and earlier used a non-constant time comparison function when validating an HMAC. | ||
| CVE-2020-2101 | Med | 0.28 | 5.3 | 0.01 | Jan 29, 2020 | Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret. | ||
| CVE-2019-18886 | Med | 0.28 | 5.3 | 0.02 | Nov 21, 2019 | An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to… | ||
| CVE-2018-10919 | Med | 0.28 | 4.3 | 0.02 | Aug 22, 2018 | The Samba Active Directory LDAP server was vulnerable to an information disclosure flaw because of missing access control checks. An authenticated attacker could use this flaw to extract confidential attribute values using LDAP search expressions. Samba versions before 4.6.16,… | ||
| CVE-2026-45294 | Med | 0.27 | 5.3 | 0.00 | May 29, 2026 | 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… | ||
| CVE-2026-45410 | Med | 0.27 | 5.3 | 0.00 | May 28, 2026 | 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… | ||
| CVE-2026-26895 | Med | 0.27 | 5.3 | 0.00 | Apr 2, 2026 | User enumeration vulnerability in /pwreset.php in osTicket v1.18.2 allows remote attackers to enumerate valid usernames registered in the platform. | ||
| CVE-2026-33429 | Med | 0.27 | 5.3 | 0.00 | Mar 24, 2026 | 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… | ||
| CVE-2026-33425 | Med | 0.27 | 5.3 | 0.00 | Mar 21, 2026 | 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`… | ||
| CVE-2026-26185 | Med | 0.27 | 5.3 | 0.00 | Feb 12, 2026 | 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… | ||
| CVE-2026-25509 | Med | 0.27 | 5.3 | 0.00 | Feb 3, 2026 | 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… |
- risk 0.28cvss 4.3epss 0.00
In Kaden PICOFLUX Air in all known versions an information exposure through observable discrepancy exists. This may give sensitive information (water consumption without distinct values) to third parties.
- risk 0.28cvss 5.3epss 0.05
OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a…
- risk 0.28cvss 5.3epss 0.01
An issue was discovered in Arm Mbed TLS before 2.23.0. A side channel allows recovery of an ECC private key, related to mbedtls_ecp_check_pub_priv, mbedtls_pk_parse_key, mbedtls_pk_parse_keyfile, mbedtls_ecp_mul, and mbedtls_ecp_mul_restartable.
- risk 0.28cvss 5.3epss 0.02
An issue was discovered in Arm Mbed TLS before 2.23.0. Because of a side channel in modular exponentiation, an RSA private key used in a secure enclave could be disclosed.
- risk 0.28cvss 5.3epss 0.03
Flask-AppBuilder is a development framework, built on top of Flask. User enumeration in database authentication in Flask-AppBuilder <= 3.2.3. Allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in.…
- risk 0.28cvss 5.3epss 0.02
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch…
- risk 0.28cvss 5.3epss 0.01
In Legion of the Bouncy Castle BC before 1.61 and BC-FJA before 1.0.1.2, attackers can obtain sensitive information about a private exponent because of Observable Differences in Behavior to Error Inputs. This occurs in org.bouncycastle.crypto.encodings.OAEPEncoding. Sending…
- risk 0.28cvss 4.3epss 0.02
Side-channel information leakage in scroll to text in Google Chrome prior to 84.0.4147.89 allowed a remote attacker to leak cross-origin data via a crafted HTML page.
- risk 0.28cvss 5.3epss 0.02
Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.
- risk 0.28cvss 5.3epss 0.01
Jenkins 2.218 and earlier, LTS 2.204.1 and earlier used a non-constant time comparison function when validating an HMAC.
- risk 0.28cvss 5.3epss 0.01
Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.
- risk 0.28cvss 5.3epss 0.02
An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to…
- risk 0.28cvss 4.3epss 0.02
The Samba Active Directory LDAP server was vulnerable to an information disclosure flaw because of missing access control checks. An authenticated attacker could use this flaw to extract confidential attribute values using LDAP search expressions. Samba versions before 4.6.16,…
- risk 0.27cvss 5.3epss 0.00
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…
- risk 0.27cvss 5.3epss 0.00
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…
- risk 0.27cvss 5.3epss 0.00
User enumeration vulnerability in /pwreset.php in osTicket v1.18.2 allows remote attackers to enumerate valid usernames registered in the platform.
- risk 0.27cvss 5.3epss 0.00
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…
- risk 0.27cvss 5.3epss 0.00
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`…
- risk 0.27cvss 5.3epss 0.00
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…
- risk 0.27cvss 5.3epss 0.00
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…