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.
378 vulnerabilities reference this CWE, most recent first.
CVE-2026-111887 (GCVE-0-2026-111887)
Vulnerability from cvelistv5 – Published: 2026-10-17 18:46 – Updated: 2026-10-18 13:26
VLAI
EPSS
VEX
Title
phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta Account Enumeration via Guest Comment Endpoint
Summary
phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta contains an account enumeration vulnerability that allows unauthenticated attackers to confirm registered display names and emails via a distinct HTTP 409 response. Attackers can submit guest comments to the comment create endpoint with candidate user and mail values to link names to emails for targeted phishing.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-18 13:25 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/thorsten/phpMyFAQ/security/adv… | vendor-advisory |
| https://www.vulncheck.com/advisories/phpmyfaq-bef… | third-party-advisory |
Impacted products
Date Public
2026-10-03 00:00
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CVE-2026-111386 (GCVE-0-2026-111386)
Vulnerability from cvelistv5 – Published: 2026-10-16 01:17 – Updated: 2026-10-16 13:56
VLAI
EPSS
VEX
Title
Nezha 1.7.0 before 2.3.15 Cross-Tenant Server-ID Enumeration via getServerConfig
Summary
Nezha from 1.7.0 before 2.3.15 contains an information disclosure vulnerability that allows authenticated members to enumerate other tenants' server IDs through differential responses. Attackers can sweep sequential IDs against getServerConfig and setServerConfig, distinguishing 'permission denied' from success payloads to map other users' servers.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 13:55 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nezhahq/nezha/security/advisor… | vendor-advisory |
| https://github.com/nezhahq/nezha/commit/36b742a7e… | patch |
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Impacted products
Date Public
2026-10-01 00:00
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CVE-2026-111235 (GCVE-0-2026-111235)
Vulnerability from cvelistv5 – Published: 2026-10-15 18:45 – Updated: 2026-10-16 19:59
VLAI
EPSS
VEX
Title
OpenNMS REST authorization bypass via non-canonical HTTP method
Summary
An authorization bypass vulnerability exists in the REST API of multiple versions of OpenNMS Meridian and Horizon. The /rest/** Spring Security filter chains authorize requests with intercept-url rules that name the HTTP method as an uppercase token, compare the method case-sensitively, and have no terminal deny rule. A request that uses a non-canonical (for example lowercase) method token matches no rule and is processed without authentication. A remote, unauthenticated attacker can read the monitored inventory and can create, modify, or delete resources through the REST API, which includes injecting events to fabricate or suppress alarms. The /rest/alarms chain has the same missing deny rule and discloses whether an alarm exists through a difference in the response. The fix adds a terminal deny rule to each REST filter chain.
The solution is to upgrade to Meridian 2024.3.14, 2025.0.11, 2026.0.1 and Horizon 36.0.5 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:59 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/OpenNMS/opennms/pull/8934 | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| The OpenNMS Group | Meridian |
Affected:
2024.1.0 , < 2024.3.14
(maven)
Affected: 2025.0.0 , < 2025.0.11 (maven) Affected: 2026.0.0 , < 2026.0.1 (maven) |
|
| The OpenNMS Group | Horizon |
Affected:
36.0.0 , < 36.0.5
(maven)
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CVE-2026-111056 (GCVE-0-2026-111056)
Vulnerability from cvelistv5 – Published: 2026-10-19 16:00 – Updated: 2026-10-22 03:02
VLAI
EPSS
VEX
Title
FOSSBilling: Unauthenticated client account enumeration via guest signup endpoint
Summary
FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct unredacted error when the submitted email already exists. The trigger is an unauthenticated request to POST /api/guest/client/create with a target email address. An attacker can compare the guest-signup response for a target email to determine whether the email belongs to an existing FOSSBilling client. Box\Mod\Client\Api\Guest::create returns the error after Client\Service::clientAlreadyExists finds a matching record, and the API response exposes that exception message without redaction. This issue is fixed in version 0.8.7.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-22 03:02 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/FOSSBilling/FOSSBilling/securi… | x_refsource_CONFIRM |
| https://github.com/FOSSBilling/FOSSBilling/pull/4234 | x_refsource_MISC |
| https://github.com/FOSSBilling/FOSSBilling/commit… | x_refsource_MISC |
| https://github.com/FOSSBilling/FOSSBilling/releas… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FOSSBilling | FOSSBilling |
Affected:
>= 0.1.0, < 0.8.7
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CVE-2026-110310 (GCVE-0-2026-110310)
Vulnerability from cvelistv5 – Published: 2026-10-14 19:37 – Updated: 2026-10-14 19:46
VLAI
EPSS
VEX
Title
RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET
Summary
A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover the RSA-wrapped envelope key and decrypt the object.
To remediate this issue, we recommend that users upgrade to version 3.2.2 or 4.0.3. The 1.x and 2.x lines will not be patched, users of those lines need to migrate to 3.2.2 or 4.0.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 19:46 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://www.nuget.org/packages/Amazon.Extensions.… | release-notespatch |
| https://www.nuget.org/packages/Amazon.Extensions.… | release-notespatch |
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
| https://github.com/aws/amazon-s3-encryption-clien… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Amazon | Amazon.Extensions.S3.Encryption |
Affected:
2.1.0 , ≤ 2.*
(custom)
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CVE-2026-109206 (GCVE-0-2026-109206)
Vulnerability from cvelistv5 – Published: 2026-10-12 13:39 – Updated: 2026-10-13 15:18
VLAI
EPSS
VEX
Title
LogicalDOC Community Edition through 9.3 Username Enumeration via AvatarServlet
Summary
LogicalDOC Community Edition through 9.3 contains a username enumeration vulnerability that allows unauthenticated attackers to identify valid accounts because the AvatarServlet (/avatar) performs no session validation. Attackers can supply usernames or numeric IDs in the userId parameter and compare 1x1 transparent images against real avatars to enumerate users and retrieve profile pictures.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 15:17 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/logicaldoc/community/discussions/119 | technical-description |
| https://github.com/logicaldoc/community/commit/4e… | patch |
| https://github.com/logicaldoc/community/blob/9.3/… | technical-description |
| https://github.com/logicaldoc/community | product |
| https://www.vulncheck.com/advisories/logicaldoc-c… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| LogicalDOC | LogicalDOC Community Edition |
Affected:
0 , ≤ 9.3
(custom)
cpe:2.3:a:logicaldoc:logicaldoc:*:*:*:*:community:*:*:* |
Date Public
2026-10-11 00:00
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CVE-2026-107843 (GCVE-0-2026-107843)
Vulnerability from cvelistv5 – Published: 2026-10-09 19:21 – Updated: 2026-10-13 17:08
VLAI
EPSS
VEX
Title
Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha check
Summary
Contao is an Open Source CMS. From version 4.1.0 until 5.3.50 and 5.7.12, ModuleRegistration::compile() enters its follow-up registration branch on any POST to a page containing the registration module without verifying FORM_SUBMIT or the preceding captcha result. resendActivationMail() can then invoke OptInToken::send() without rate limiting, allowing an unauthenticated attacker to cause repeated activation emails to be sent to an address with a pending registration and to determine whether that pending registration exists. The branch is reachable only when reg_activate is enabled and the target has an unconfirmed registration and opt-in token. This issue is fixed in versions 5.3.50 and 5.7.12.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 17:08 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/contao/contao/security/advisor… | x_refsource_CONFIRM |
| https://github.com/contao/contao/commit/2ea6117f9… | x_refsource_MISC |
| https://github.com/contao/contao/releases/tag/5.3.50 | x_refsource_MISC |
| https://github.com/contao/contao/releases/tag/5.7.12 | x_refsource_MISC |
Impacted products
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CVE-2026-105664 (GCVE-0-2026-105664)
Vulnerability from cvelistv5 – Published: 2026-10-16 14:06 – Updated: 2026-10-16 15:20
VLAI
EPSS
VEX
Title
Guangzhou Juan IoT Technology EseeCloud Observable Response Discrepancy
Summary
The endpoint exposes an observable response discrepancy when processing ID values. A request submitted with a nonexistent ID returns a distinct error response code from one submitted with a valid, registered ID, allowing an attacker holding a valid access token - but without further authentication or authorization - to distinguish valid ID values from the full 10-digit numeric search space. Combined with the absence of meaningful rate limiting on this endpoint, this discrepancy constitutes an enumeration oracle, enabling an attacker to discover registered devices at scale.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:06 UTC
CWE
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Guangzhou Juan IoT Technology Co., Ltd. | EseeCloud App |
Affected:
0 , ≤ 4.9.6
(custom)
|
|
| Guangzhou Juan IoT Technology Co., Ltd. | EseeCloud Firmware |
Affected:
0 , ≤ 4.9.86.0
(custom)
|
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CVE-2026-104439 (GCVE-0-2026-104439)
Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-02 13:31
VLAI
EPSS
VEX
Title
YesWiki before 4.6.7 User Enumeration via Lost-Password Flow
Summary
YesWiki before 4.6.7 contains a user enumeration vulnerability in LostPasswordAction.php that allows unauthenticated attackers to confirm registered email addresses through differing responses. Attackers can submit emails to the MotDePassePerdu recovery page without rate limiting to identify valid accounts for targeted phishing or password-spraying.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 13:31 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/YesWiki/yeswiki/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/yeswiki-befo… | third-party-advisory |
Impacted products
Date Public
2026-08-31 00:00
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CVE-2026-102587 (GCVE-0-2026-102587)
Vulnerability from cvelistv5 – Published: 2026-09-30 08:36 – Updated: 2026-09-30 15:28
VLAI
EPSS
VEX
Title
Moodle: user list filters bypass profile field visibility
Summary
A flaw was found in Moodle. User list filters do not properly enforce visibility restrictions on user profile fields. An authorized user with manager privileges can filter user lists using profile attributes they are not permitted to view directly, resulting in unauthorized information disclosure by inferring hidden user data.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 13:56 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
4 references
| URL | Tags |
|---|---|
| http://git.moodle.org/gw?p=moodle.git&a=search&h=… | |
| https://access.redhat.com/security/cve/CVE-2026-102587 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2543642 | issue-trackingx_refsource_REDHAT |
| https://moodle.org/mod/forum/discuss.php?d=482506 |
Impacted products
Date Public
2026-09-29 20:17
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"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-09-29T20:17:12.000Z",
"value": "Made public."
}
],
"title": "Moodle: user list filters bypass profile field visibility",
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-204: Observable Response Discrepancy"
}
},
"cveMetadata": {
"assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
"assignerShortName": "fedora",
"cveId": "CVE-2026-102587",
"datePublished": "2026-09-30T08:36:21.495Z",
"dateReserved": "2026-09-29T14:03:38.494Z",
"dateUpdated": "2026-09-30T15:28:08.265Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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.