Common Weakness Enumeration

CWE-204

Allowed

Observable 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.

341 vulnerabilities reference this CWE, most recent first.

CVE-2026-45620 (GCVE-0-2026-45620)

Vulnerability from cvelistv5 – Published: 2026-05-29 13:07 – Updated: 2026-05-30 02:30

Title

AVideo CVE-2026-43881 incomplete fix - `objects/mention.json.php:17` is an unauthenticated user enumeration

Summary

WWBN AVideo is an open source video platform. In 29.0 and earlier, objects/mention.json.php has no User::loginCheck() or admin gate. It only has an entry guard: preg_match('/^@/', $_REQUEST['term']) and hard-coded rowCount=10. This enables unauthenticated user enumeration.

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 2026-05-30 02:30 UTC

CWE

CWE-204 - Observable Response Discrepancy
CWE-285 - Improper Authorization

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/WWBN/AVideo/security/advisorie…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
WWBN	AVideo	Affected: <= 29.0

Show details on NVD website

JSON

To clipboard

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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

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

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/freescout-help-desk/freescout/…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
freescout-help-desk	freescout	Affected: < 1.8.219

Show details on NVD website

JSON

To clipboard

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CVE-2026-44753 (GCVE-0-2026-44753)

Vulnerability from cvelistv5 – Published: 2026-07-14 00:19 – Updated: 2026-07-14 12:38

Title

Information Disclosure vulnerability in SAP HANA Extended Application Services classic model (User Self Service)

Summary

SAP HANA Database (user self service tools) allows an unauthenticated user to send specially crafted requests that produce distinguishable responses, enabling enumeration of valid user accounts and email addresses. Successful exploitation could allow the attacker to enumerate valid user accounts, resulting in low impact on confidentiality, with no impact on integrity and availability of the application.

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 2026-07-14 12:38 UTC

CWE

CWE-204 - Observable Response Discrepancy

Assigner

sap mitre root

References

2 references

URL	Tags
https://me.sap.com/notes/3732522
https://url.sap/sapsecuritypatchday

Impacted products

1 product

Vendor	Product	Version
SAP_SE	SAP HANA Extended Application Services classic model (User Self Service)	Affected: HDB 2.00

Show details on NVD website

JSON

To clipboard

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CVE-2026-44306 (GCVE-0-2026-44306)

Vulnerability from cvelistv5 – Published: 2026-05-12 21:30 – Updated: 2026-05-13 18:20

Title

Statamic: Email enumeration via forgot password endpoint

Summary

Statamic is a Laravel and Git powered content management system (CMS). Prior to 5.73.21 and 6.15.0, responses from the forgot password forms hinted at whether an account existed for a given email address. An unauthenticated attacker could use this to enumerate valid users, which can aid in follow-up credential-based attacks. This vulnerability is fixed in 5.73.21 and 6.15.0.

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 2026-05-13 18:15 UTC

CWE

CWE-204 - Observable Response Discrepancy

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/statamic/cms/security/advisori…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
statamic	cms	Affected: < 5.73.21 Affected: >= 6.0.0, < 6.15.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-43926 (GCVE-0-2026-43926)

Vulnerability from cvelistv5 – Published: 2026-06-04 12:46 – Updated: 2026-06-04 14:37

Title

FOSSBilling's password reset confirmation endpoint lacks rate limiting

Summary

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the password reset confirmation endpoint `/client/reset-password-confirm/:hash` is handled by a non-API controller and is not covered by FOSSBilling's rate limiter, which only applies to `/api/*` routes. This allows an attacker to probe the endpoint for valid reset tokens without any per-IP request limiting, attempt counting, or lockout mechanism. The endpoint acts as an oracle, returning a distinguishable response for valid versus invalid tokens (HTTP 200 vs HTTP 302 redirect). An attacker can submit unlimited token guesses to the password reset confirmation endpoint with no throttling applied. However, practical exploitability is significantly mitigated by the current token generation, which uses `hash('sha256', random_bytes(32))`, providing 256 bits of entropy. Tokens also expire after 15 minutes and are deleted after successful use. The same architectural gap applies to other controller-served auth routes, including `/staff/email/:hash` (admin password reset confirmation) and `/client/confirm-email/:hash` (email confirmation). Version 0.8.0 fixes the issue. Some workarounds are available. Configure a reverse proxy (e.g., Nginx, Apache, Cloudflare) to apply per-IP rate limiting to the `/client/reset-password-confirm/*` and `/staff/email/*` paths and/or use a WAF rule to limit request rates to these endpoints.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/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 2026-06-04 14:36 UTC

CWE

CWE-204 - Observable Response Discrepancy
CWE-307 - Improper Restriction of Excessive Authentication Attempts

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/FOSSBilling/FOSSBilling/securi…	x_refsource_CONFIRM
https://github.com/FOSSBilling/FOSSBilling/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FOSSBilling	FOSSBilling	Affected: < 0.8.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-42218 (GCVE-0-2026-42218)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:44 – Updated: 2026-07-20 17:52

Title

XRDP is vulnerable to a server timing attack, leading to user enumeration

Summary

xrdp is an open source RDP server. Versions 0.10.6 and prior contain a timing side-channel vulnerability in the login interface. Due to a discrepancy in response processing times, a remote attacker can infer the existence of a username on the system, leading to unauthorized information disclosure via username enumeration. This issue has been fixed in version 0.10.6.1.

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 2026-07-20 17:52 UTC

CWE

CWE-204 - Observable Response Discrepancy

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/neutrinolabs/xrdp/security/adv…	x_refsource_CONFIRM
https://github.com/neutrinolabs/xrdp/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
neutrinolabs	xrdp	Affected: < 0.10.6.1

Show details on NVD website

JSON

To clipboard

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CVE-2026-40485 (GCVE-0-2026-40485)

Vulnerability from cvelistv5 – Published: 2026-04-17 23:29 – Updated: 2026-04-20 13:36

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)


                        
                          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 2026-04-20 13:28 UTC

CWE

CWE-307 - Improper Restriction of Excessive Authentication Attempts
CWE-204 - Observable Response Discrepancy

Assigner

GitHub_M mitre root

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

Impacted products

1 product

Vendor	Product	Version
ChurchCRM	CRM	Affected: < 7.2.0

Show details on NVD website

JSON

To clipboard

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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

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

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: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-08 19:16 UTC

CWE

CWE-204 - Observable Response Discrepancy

Assigner

GitHub_M mitre root

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

1 product

Vendor	Product	Version
saleor	saleor	Affected: >= 2.10.0, < 3.20.118 Affected: >= 3.21.0-a.0, < 3.21.54 Affected: >= 3.22.0-a.0, < 3.22.47 Affected: >= 3.23.0-a.0, < 3.23.0a3

Show details on NVD website

JSON

To clipboard

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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

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)


                        
                          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 2026-04-14 12:53 UTC

CWE

CWE-204 - Observable Response Discrepancy

Assigner

sap mitre root

References

2 references

URL	Tags
https://me.sap.com/notes/3680767
https://url.sap/sapsecuritypatchday

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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JSON

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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

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)


                        
                          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 2026-03-24 14:09 UTC

CWE

CWE-204 - Observable Response Discrepancy

Assigner

GitHub_M mitre root

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

Impacted products

1 product

Vendor	Product	Version
WWBN	AVideo	Affected: <= 26.0

Show details on NVD website

JSON

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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