Common Weakness Enumeration
CWE-204
AllowedObservable Response Discrepancy
Abstraction: Base · Status: Incomplete
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.
297 vulnerabilities reference this CWE, most recent first.
CVE-2026-40485 (GCVE-0-2026-40485)
Vulnerability from cvelistv5 – Published: 2026-04-17 23:29 – Updated: 2026-04-20 13:36
VLAI
EPSS
VEX
Title
ChurchCRM: Username Enumeration via Differential Response in Public Login API
Summary
ChurchCRM is an open-source church management system. In versions prior to 7.2.0, the public API login endpoint (/api/public/user/login) returns distinguishable HTTP response codes based on whether a username exists: 404 for non-existent users and 401 for valid users with incorrect passwords. An unauthenticated attacker can exploit this difference to enumerate valid usernames, with no rate limiting or account lockout to impede the process. This issue has been fixed in version 7.2.0.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/ChurchCRM/CRM/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ChurchCRM/CRM/pull/8607 | x_refsource_MISC |
| https://github.com/ChurchCRM/CRM/commit/214694eb8… | x_refsource_MISC |
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CVE-2026-39851 (GCVE-0-2026-39851)
Vulnerability from cvelistv5 – Published: 2026-04-08 17:33 – Updated: 2026-04-08 19:22
VLAI
EPSS
VEX
Title
Saleor has a user enumeration vulnerability due to different error messages
Summary
Saleor is an e-commerce platform. From 2.10.0 to before 3.23.0a3, 3.22.47, 3.21.54, and 3.20.118, the requestEmailChange() mutation was revealing the existence of user-provided email addresses in error messages. This vulnerability is fixed in 3.23.0a3, 3.22.47, 3.21.54, and 3.20.118.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/saleor/saleor/security/advisor… | x_refsource_CONFIRM |
| https://github.com/saleor/saleor/commit/7be352fa8… | x_refsource_MISC |
| https://github.com/saleor/saleor/commit/cdb66da97… | x_refsource_MISC |
| https://github.com/saleor/saleor/commit/d6a94e95b… | x_refsource_MISC |
| https://github.com/saleor/saleor/commit/e42aa4d6e… | x_refsource_MISC |
| https://github.com/saleor/saleor/commit/f0371bdd4… | x_refsource_MISC |
Impacted products
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CVE-2026-34264 (GCVE-0-2026-34264)
Vulnerability from cvelistv5 – Published: 2026-04-14 00:09 – Updated: 2026-04-14 13:14
VLAI
EPSS
VEX
Title
Information Disclosure vulnerability in SAP Human Capital Management for SAP S/4HANA
Summary
During authorization checks in SAP Human Capital Management for SAP S/4HANA, the system returns specific messages. Due to this, an authenticated user with low privileges could guess and enumerate the content shown, beyond their authorized scope. This leads to disclosure of sensitive information causing a high impact on confidentiality, while integrity and availability are unaffected.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SAP_SE | SAP Human Capital Management for SAP S/4HANA |
Affected:
S4HCMRXX 100
Affected: 101 Affected: 102 Affected: SAP_HRRXX 600 Affected: 604 Affected: 608 |
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CVE-2026-33688 (GCVE-0-2026-33688)
Vulnerability from cvelistv5 – Published: 2026-03-23 18:43 – Updated: 2026-03-24 14:10
VLAI
EPSS
VEX
Title
AVideo has Pre-Captcha User Enumeration and Account Status Disclosure in Password Recovery Endpoint
Summary
WWBN AVideo is an open source video platform. In versions up to and including 26.0, the password recovery endpoint at `objects/userRecoverPass.php` performs user existence and account status checks before validating the captcha. This allows an unauthenticated attacker to enumerate valid usernames and determine whether accounts are active, inactive, or banned — at scale and without solving any captcha — by observing three distinct JSON error responses. Commit e42f54123b460fd1b2ee01f2ce3d4a386e88d157 contains a patch.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/WWBN/AVideo/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/WWBN/AVideo/commit/e42f54123b4… | x_refsource_MISC |
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CVE-2026-33419 (GCVE-0-2026-33419)
Vulnerability from cvelistv5 – Published: 2026-03-24 19:05 – Updated: 2026-03-25 13:24
VLAI
EPSS
VEX
Title
MinIO: LDAP login brute-force via user enumeration and missing rate limit
Summary
MinIO is a high-performance object storage system. Prior to RELEASE.2026-03-17T21-25-16Z, MinIO AIStor's STS (Security Token Service) AssumeRoleWithLDAPIdentity endpoint is vulnerable to LDAP credential brute-forcing due to two combined weaknesses: (1) distinguishable error responses that enable username enumeration, and (2) absence of rate limiting on authentication attempts. An unauthenticated network attacker can enumerate valid LDAP usernames and then perform unlimited password guessing to obtain temporary AWS-style STS credentials, gaining access to the victim's S3 buckets and objects. This issue has been patched in RELEASE.2026-03-17T21-25-16Z.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/minio/minio/security/advisorie… | x_refsource_CONFIRM |
Impacted products
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CVE-2026-33323 (GCVE-0-2026-33323)
Vulnerability from cvelistv5 – Published: 2026-03-24 18:06 – Updated: 2026-03-25 14:28
VLAI
EPSS
VEX
Title
Parse Server: Email verification resend page leaks user existence
Summary
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.51 and 9.6.0-alpha.40, the Pages route and legacy PublicAPI route for resending email verification links return distinguishable responses depending on whether the provided username exists and has an unverified email. This allows an unauthenticated attacker to enumerate valid usernames by observing different redirect targets. The existing emailVerifySuccessOnInvalidEmail configuration option, which is enabled by default and protects the API route against this, did not apply to these routes. This issue has been patched in versions 8.6.51 and 9.6.0-alpha.40.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/parse-community/parse-server/s… | x_refsource_CONFIRM |
| https://github.com/parse-community/parse-server/p… | x_refsource_MISC |
| https://github.com/parse-community/parse-server/p… | x_refsource_MISC |
| https://github.com/parse-community/parse-server/c… | x_refsource_MISC |
| https://github.com/parse-community/parse-server/c… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| parse-community | parse-server |
Affected:
< 8.6.51
Affected: >= 9.0.0, < 9.6.0-alpha.40 |
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CVE-2026-31901 (GCVE-0-2026-31901)
Vulnerability from cvelistv5 – Published: 2026-03-11 19:18 – Updated: 2026-03-12 20:01
VLAI
EPSS
VEX
Title
Parse Server has user enumeration via email verification endpoint
Summary
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.34 and 9.6.0-alpha.8, the email verification endpoint (/verificationEmailRequest) returns distinct error responses depending on whether an email address belongs to an existing user, is already verified, or does not exist. An attacker can send requests with different email addresses and observe the error codes to determine which email addresses are registered in the application. This is a user enumeration vulnerability that affects any Parse Server deployment with email verification enabled (verifyUserEmails: true). This vulnerability is fixed in 8.6.34 and 9.6.0-alpha.8.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/parse-community/parse-server/s… | x_refsource_CONFIRM |
| https://github.com/parse-community/parse-server/r… | x_refsource_MISC |
| https://github.com/parse-community/parse-server/r… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| parse-community | parse-server |
Affected:
>= 9.0.0 < 9.6.0-alpha.8
Affected: < 8.6.34 |
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CVE-2026-31888 (GCVE-0-2026-31888)
Vulnerability from cvelistv5 – Published: 2026-03-11 18:53 – Updated: 2026-03-12 20:02
VLAI
EPSS
VEX
Title
Shopware has user enumeration via distinct error codes on Store API login endpoint
Summary
Shopware is an open commerce platform. Prior to 6.7.8.1 and 6.6.10.15, the Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense. This vulnerability is fixed in 6.7.8.1 and 6.6.10.15.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/shopware/shopware/security/adv… | x_refsource_CONFIRM |
Impacted products
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CVE-2026-30876 (GCVE-0-2026-30876)
Vulnerability from cvelistv5 – Published: 2026-03-16 19:18 – Updated: 2026-03-16 20:22
VLAI
EPSS
VEX
Title
Chamilo LMS: User enumeration vulnerability via response
Summary
Chamilo LMS is a learning management system. Prior to version 1.11.36, Chamilo is vulnerable to user enumeration with valid/invalid username. This issue has been patched in version 1.11.36.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/chamilo/chamilo-lms/security/a… | x_refsource_CONFIRM |
| https://github.com/chamilo/chamilo-lms/releases/t… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| chamilo | chamilo-lms |
Affected:
< 1.11.36
|
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"title": "Chamilo LMS: User enumeration vulnerability via response"
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CVE-2026-28358 (GCVE-0-2026-28358)
Vulnerability from cvelistv5 – Published: 2026-03-02 16:16 – Updated: 2026-03-03 16:02
VLAI
EPSS
VEX
Title
NocoDB: User Enumeration via Password Reset Endpoint
Summary
NocoDB is software for building databases as spreadsheets. Prior to version 0.301.3, the password forgot endpoint returned different responses for registered and unregistered emails, allowing user enumeration. This issue has been patched in version 0.301.3.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/nocodb/nocodb/security/advisor… | x_refsource_CONFIRM |
| https://github.com/nocodb/nocodb/releases/tag/0.301.3 | x_refsource_MISC |
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"discovery": "UNKNOWN"
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"title": "NocoDB: User Enumeration via Password Reset Endpoint"
}
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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.