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.
326 vulnerabilities reference this CWE, most recent first.
CVE-2026-24097 (GCVE-0-2026-24097)
Vulnerability from cvelistv5 – Published: 2026-03-13 09:40 – Updated: 2026-03-13 15:56
VLAI
EPSS
VEX
Title
Authenticated Host Enumeration via Observable Response Discrepancy on Agent Register Existing Endpoint
Summary
Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows authenticated users to enumerate existing hosts by observing different HTTP response codes in agent-receiver/register_existing endpoint, which could lead to information disclosure.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-13 15:56 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://checkmk.com/werk/18993 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Checkmk GmbH | Checkmk |
Affected:
2.4.0 , < 2.4.0p23
(semver)
Affected: 2.3.0 , < 2.3.0p43 (semver) Affected: 2.2.0 (semver) cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:* cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:* cpe:2.3:a:checkmk:checkmk:2.2.0:*:*:*:*:*:*:* |
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CVE-2026-23511 (GCVE-0-2026-23511)
Vulnerability from cvelistv5 – Published: 2026-01-15 19:09 – Updated: 2026-01-15 19:56
VLAI
EPSS
VEX
Title
ZITADEL has a user enumeration vulnerability in Login UIs
Summary
ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-15 19:56 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/zitadel/zitadel/security/advis… | x_refsource_CONFIRM |
| https://github.com/zitadel/zitadel/commit/b85ab69… | x_refsource_MISC |
| https://github.com/zitadel/zitadel/commit/c300d4c… | x_refsource_MISC |
| https://github.com/zitadel/zitadel/releases/tag/v3.4.6 | x_refsource_MISC |
| https://github.com/zitadel/zitadel/releases/tag/v4.9.1 | x_refsource_MISC |
Impacted products
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CVE-2026-21484 (GCVE-0-2026-21484)
Vulnerability from cvelistv5 – Published: 2026-01-03 01:21 – Updated: 2026-01-05 20:36
VLAI
EPSS
VEX
Title
AnythingLLM Vulnerable to Username Enumeration w/ Password Recovery
Summary
AnythingLLM is an application that turns pieces of content into context that any LLM can use as references during chatting. Prior to commit e287fab56089cf8fcea9ba579a3ecdeca0daa313, the password recovery endpoint returns different error messages depending on whether a username exists, so enabling username enumeration. Commit e287fab56089cf8fcea9ba579a3ecdeca0daa313 fixes this issue.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-05 20:32 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/Mintplex-Labs/anything-llm/sec… | x_refsource_CONFIRM |
| https://github.com/Mintplex-Labs/anything-llm/com… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mintplex-Labs | anything-llm |
Affected:
< e287fab56089cf8fcea9ba579a3ecdeca0daa313
|
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CVE-2026-20195 (GCVE-0-2026-20195)
Vulnerability from cvelistv5 – Published: 2026-05-06 16:14 – Updated: 2026-05-06 17:48
VLAI
EPSS
VEX
Title
Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
Summary
A vulnerability in an identity management API endpoint of Cisco ISE could allow an unauthenticated, remote attacker to enumerate valid user accounts on an affected device.
This vulnerability exists because error messages are observed when the affected API endpoint is called. An attacker could exploit this vulnerability by sending a series of crafted requests to the affected endpoint and analyzing the differentiated responses. A successful exploit could allow the attacker to compile a list of valid usernames on an affected system.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-06 17:34 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Identity Services Engine Software |
Affected:
3.3.0
Affected: 3.3 Patch 2 Affected: 3.3 Patch 1 Affected: 3.3 Patch 3 Affected: 3.4.0 Affected: 3.3 Patch 4 Affected: 3.4 Patch 1 Affected: 3.3 Patch 5 Affected: 3.3 Patch 6 Affected: 3.4 Patch 2 Affected: 3.3 Patch 7 Affected: 3.4 Patch 3 Affected: 3.5.0 Affected: 3.4 Patch 4 Affected: 3.3 Patch 8 Affected: 3.5 Patch 1 Affected: 3.3 Patch 9 Affected: 3.4 Patch 5 Affected: 3.5 Patch 3 Affected: 3.5 Patch 2 Affected: 3.3 Patch 10 |
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CVE-2026-19965 (GCVE-0-2026-19965)
Vulnerability from cvelistv5 – Published: 2026-08-17 00:00 – Updated: 2026-08-19 14:46 X_Open Source
VLAI
EPSS
VEX
Title
automad Password Reset Endpoint UserController.php requestPasswordResetToken response discrepancy
Summary
A vulnerability was determined in automad up to 2.0.0-beta.32. This vulnerability affects the function requestPasswordResetToken of the file automad/src/server/Controllers/API/UserController.php of the component Password Reset Endpoint. This manipulation of the argument name-or-email causes observable response discrepancy. The attack can be initiated remotely. The attack's complexity is rated as high. It is stated that the exploitability is difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.0.0-beta.33 is able to resolve this issue. Patch name: eac0b05dafdb0ddf8b9139dad8929aaba86568ca. You should upgrade the affected component.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 14:46 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/391142 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/391142/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-19965 | third-party-advisory |
| https://vuldb.com/submit/873022 | third-party-advisory |
| https://github.com/marcantondahmen/automad/issues/191 | exploitissue-tracking |
| https://github.com/marcantondahmen/automad/commit… | patch |
| https://github.com/marcantondahmen/automad/releas… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | automad |
Affected:
2.0.0-beta.0
Affected: 2.0.0-beta.1 Affected: 2.0.0-beta.2 Affected: 2.0.0-beta.3 Affected: 2.0.0-beta.4 Affected: 2.0.0-beta.5 Affected: 2.0.0-beta.6 Affected: 2.0.0-beta.7 Affected: 2.0.0-beta.8 Affected: 2.0.0-beta.9 Affected: 2.0.0-beta.10 Affected: 2.0.0-beta.11 Affected: 2.0.0-beta.12 Affected: 2.0.0-beta.13 Affected: 2.0.0-beta.14 Affected: 2.0.0-beta.15 Affected: 2.0.0-beta.16 Affected: 2.0.0-beta.17 Affected: 2.0.0-beta.18 Affected: 2.0.0-beta.19 Affected: 2.0.0-beta.20 Affected: 2.0.0-beta.21 Affected: 2.0.0-beta.22 Affected: 2.0.0-beta.23 Affected: 2.0.0-beta.24 Affected: 2.0.0-beta.25 Affected: 2.0.0-beta.26 Affected: 2.0.0-beta.27 Affected: 2.0.0-beta.28 Affected: 2.0.0-beta.29 Affected: 2.0.0-beta.30 Affected: 2.0.0-beta.31 Affected: 2.0.0-beta.32 Unaffected: 2.0.0-beta.33 cpe:2.3:a:automad:automad:*:*:*:*:*:*:*:* |
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CVE-2026-15747 (GCVE-0-2026-15747)
Vulnerability from cvelistv5 – Published: 2026-07-14 17:07 – Updated: 2026-07-15 16:32
VLAI
EPSS
VEX
Title
Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle
Summary
Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle.
_csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden `csrf_token` input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle.
An attacker able to query it can recover the token and pass csrf_protect validation.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 16:31 UTC
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SRI | Mojolicious |
Affected:
4.59 , < 9.48
(custom)
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CVE-2026-14672 (GCVE-0-2026-14672)
Vulnerability from cvelistv5 – Published: 2026-08-13 13:00 – Updated: 2026-08-29 23:07
VLAI
EPSS
VEX
Title
PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle
Summary
Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count. This requires the probed user to have a non-default scram_iterations count, because the authentication challenge for a nonexistent user reports the default scram_iterations. Within major versions 16-18, minor versions before PostgreSQL 18.6, 17.11, and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:47 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | PostgreSQL |
Affected:
18 , < 18.6
(rpm)
Affected: 17 , < 17.11 (rpm) Affected: 16 , < 16.15 (rpm) |
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CVE-2026-14202 (GCVE-0-2026-14202)
Vulnerability from cvelistv5 – Published: 2026-08-04 09:07 – Updated: 2026-08-04 12:52
VLAI
EPSS
VEX
Title
Username Enumeration via Differential Login Responses in Bilin Software's HUMANIST Digital Human Resources
Summary
Observable response discrepancy vulnerability in Bilin Software and Informatics Consultancy Inc. HUMANIST Digital Human Resources allows Account Footprinting.
This issue affects HUMANIST Digital Human Resources: from 26.0 before 26.1.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 12:50 UTC
CWE
- CWE-204 - Observable response discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://siberguvenlik.gov.tr/guvenlik-bildirimler… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Bilin Software and Informatics Consultancy Inc. | HUMANIST Digital Human Resources |
Affected:
26.0 , < 26.1
(custom)
|
Date Public
2026-08-04 09:05
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CVE-2026-8242 (GCVE-0-2026-8242)
Vulnerability from cvelistv5 – Published: 2026-05-10 08:15 – Updated: 2026-05-11 17:31
VLAI
EPSS
VEX
Title
Industrial Application Software IAS Canias ERP Login RMI doAction response discrepancy
Summary
A vulnerability was found in Industrial Application Software IAS Canias ERP 8.03. The impacted element is the function doAction of the component Login RMI Interface. Performing a manipulation results in observable response discrepancy. The attack is possible to be carried out remotely. A high degree of complexity is needed for the attack. The exploitability is regarded as difficult. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 15:58 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/362458 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/362458/cti | signaturepermissions-required |
| https://vuldb.com/submit/808295 | third-party-advisory |
| https://hawktrace.com/blog/caniaserp | related |
| https://gist.github.com/0xb1lal/85422a63c10a001c7… | broken-linkexploit |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Industrial Application Software IAS | Canias ERP |
Affected:
8.03
|
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CVE-2026-4113 (GCVE-0-2026-4113)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:23 – Updated: 2026-04-13 18:27
VLAI
EPSS
VEX
Summary
An observable response discrepancy vulnerability in the SonicWall SMA1000 series appliances allows a remote attacker to enumerate SSL VPN user credentials.
Severity
7.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 18:27 UTC
CWE
- CWE-204 - Observable response discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://psirt.global.sonicwall.com/vuln-detail/SN… | vendor-advisory |
Impacted products
Date Public
2026-04-09 05:11
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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.