CWE-203
AllowedObservable Discrepancy
Abstraction: Base · Status: Incomplete
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
903 vulnerabilities reference this CWE, most recent first.
GHSA-75V9-W792-FFJH
Vulnerability from github – Published: 2022-12-21 15:30 – Updated: 2022-12-21 15:30In registerLocalOnlyHotspotSoftApCallback of WifiManager.java, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-233605242
{
"affected": [],
"aliases": [
"CVE-2022-20535"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-12-16T16:15:00Z",
"severity": "LOW"
},
"details": "In registerLocalOnlyHotspotSoftApCallback of WifiManager.java, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-233605242",
"id": "GHSA-75v9-w792-ffjh",
"modified": "2022-12-21T15:30:17Z",
"published": "2022-12-21T15:30:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-20535"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/pixel/2022-12-01"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-75W9-R4RF-Q9VM
Vulnerability from github – Published: 2023-10-30 18:30 – Updated: 2023-11-07 03:30In Input Method, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
{
"affected": [],
"aliases": [
"CVE-2023-21338"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-10-30T17:15:49Z",
"severity": "MODERATE"
},
"details": "In Input Method, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.",
"id": "GHSA-75w9-r4rf-q9vm",
"modified": "2023-11-07T03:30:25Z",
"published": "2023-10-30T18:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-21338"
},
{
"type": "WEB",
"url": "https://source.android.com/docs/security/bulletin/android-14"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-75XC-QVXH-27F8
Vulnerability from github – Published: 2021-04-19 14:51 – Updated: 2021-04-16 23:15Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack
- https://vaadin.com/security/cve-2021-31403
{
"affected": [
{
"package": {
"ecosystem": "Maven",
"name": "com.vaadin:vaadin-bom"
},
"ranges": [
{
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.7.24"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "com.vaadin:vaadin-bom"
},
"ranges": [
{
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.12.3"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "com.vaadin:vaadin-server"
},
"ranges": [
{
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.7.24"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "com.vaadin:vaadin-server"
},
"ranges": [
{
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.12.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-31403"
],
"database_specific": {
"cwe_ids": [
"CWE-203",
"CWE-208"
],
"github_reviewed": true,
"github_reviewed_at": "2021-04-16T23:15:02Z",
"nvd_published_at": "2021-04-23T16:15:00Z",
"severity": "MODERATE"
},
"details": "Non-constant-time comparison of CSRF tokens in UIDL request handler in `com.vaadin:vaadin-server` versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack\n\n- https://vaadin.com/security/cve-2021-31403",
"id": "GHSA-75xc-qvxh-27f8",
"modified": "2021-04-16T23:15:02Z",
"published": "2021-04-19T14:51:06Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vaadin/framework/security/advisories/GHSA-75xc-qvxh-27f8"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-31403"
},
{
"type": "WEB",
"url": "https://github.com/vaadin/framework/pull/12188"
},
{
"type": "WEB",
"url": "https://github.com/vaadin/framework/pull/12190"
},
{
"type": "WEB",
"url": "https://vaadin.com/security/cve-2021-31403"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8"
}
GHSA-76WP-R6XR-9RX6
Vulnerability from github – Published: 2025-06-30 09:30 – Updated: 2025-07-07 21:31user enumeration vulnerability in Daily Expense Manager v1.0. To exploit this vulnerability a POST request must be sent using the name parameter in /check.php
{
"affected": [],
"aliases": [
"CVE-2025-40732"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-30T09:15:25Z",
"severity": "HIGH"
},
"details": "user enumeration vulnerability in Daily Expense Manager v1.0. To exploit this vulnerability a POST request must be sent using the name parameter in /check.php",
"id": "GHSA-76wp-r6xr-9rx6",
"modified": "2025-07-07T21:31:21Z",
"published": "2025-06-30T09:30:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40732"
},
{
"type": "WEB",
"url": "https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-daily-expense-manager"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-779J-V68W-458W
Vulnerability from github – Published: 2022-09-25 00:00 – Updated: 2022-09-28 00:00An information disclosure vulnerability exists in Rocket.Chat <v5, <v4.8.2 and <v4.7.5 due to the actionLinkHandler method was found to allow Message ID Enumeration with Regex MongoDB queries.
{
"affected": [],
"aliases": [
"CVE-2022-32218"
],
"database_specific": {
"cwe_ids": [
"CWE-200",
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-09-23T19:15:00Z",
"severity": "MODERATE"
},
"details": "An information disclosure vulnerability exists in Rocket.Chat \u003cv5, \u003cv4.8.2 and \u003cv4.7.5 due to the actionLinkHandler method was found to allow Message ID Enumeration with Regex MongoDB queries.",
"id": "GHSA-779j-v68w-458w",
"modified": "2022-09-28T00:00:24Z",
"published": "2022-09-25T00:00:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-32218"
},
{
"type": "WEB",
"url": "https://hackerone.com/reports/1406953"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-77MP-CM2P-44GJ
Vulnerability from github – Published: 2023-06-02 18:30 – Updated: 2024-04-04 04:30When dragging and dropping an image cross-origin, the image's size could potentially be leaked. This behavior was shipped in 109 and caused web compatibility problems as well as this security concern, so the behavior was disabled until further review. This vulnerability affects Firefox < 110.
{
"affected": [],
"aliases": [
"CVE-2023-25741"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-06-02T17:15:11Z",
"severity": "MODERATE"
},
"details": "When dragging and dropping an image cross-origin, the image\u0027s size could potentially be leaked. This behavior was shipped in 109 and caused web compatibility problems as well as this security concern, so the behavior was disabled until further review. This vulnerability affects Firefox \u003c 110.",
"id": "GHSA-77mp-cm2p-44gj",
"modified": "2024-04-04T04:30:08Z",
"published": "2023-06-02T18:30:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-25741"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1437126"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1812611"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1813376"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2023-05"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-78G4-C5R9-6GH7
Vulnerability from github – Published: 2023-07-05 12:30 – Updated: 2024-04-04 05:23TN-5900 Series version 3.3 and prior versions is vulnearble to user enumeration vulnerability. The vulnerability may allow a remote attacker to determine whether a user is valid during password recovery through the web login page and enable a brute force attack with valid users.
{
"affected": [],
"aliases": [
"CVE-2023-3336"
],
"database_specific": {
"cwe_ids": [
"CWE-203",
"CWE-204"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-07-05T10:15:10Z",
"severity": "MODERATE"
},
"details": "TN-5900 Series version 3.3 and prior versions is vulnearble to user enumeration vulnerability. The vulnerability may allow a remote attacker to determine whether a user is valid during password recovery through the web login page and enable a brute force attack with valid users.\n\n",
"id": "GHSA-78g4-c5r9-6gh7",
"modified": "2024-04-04T05:23:23Z",
"published": "2023-07-05T12:30:15Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3336"
},
{
"type": "WEB",
"url": "https://www.moxa.com/en/support/product-support/security-advisory/mpsa-230401-tn-5900-series-user-enumeration-vulnerability"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-78JJ-CHHM-HM82
Vulnerability from github – Published: 2022-05-24 19:04 – Updated: 2022-05-24 19:04Observable timing discrepancy in Intel(R) IPP before version 2020 update 1 may allow authorized user to potentially enable information disclosure via local access.
{
"affected": [],
"aliases": [
"CVE-2021-0001"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-06-09T20:15:00Z",
"severity": "MODERATE"
},
"details": "Observable timing discrepancy in Intel(R) IPP before version 2020 update 1 may allow authorized user to potentially enable information disclosure via local access.",
"id": "GHSA-78jj-chhm-hm82",
"modified": "2022-05-24T19:04:26Z",
"published": "2022-05-24T19:04:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-0001"
},
{
"type": "WEB",
"url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00477.html"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-7936-HRHF-Q3W5
Vulnerability from github – Published: 2026-08-25 21:31 – Updated: 2026-08-28 21:30Observable discrepancy in PerformanceAPIs in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to potentially obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
{
"affected": [],
"aliases": [
"CVE-2026-78955"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-25T21:17:51Z",
"severity": "MODERATE"
},
"details": "Observable discrepancy in PerformanceAPIs in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to potentially obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)",
"id": "GHSA-7936-hrhf-q3w5",
"modified": "2026-08-28T21:30:55Z",
"published": "2026-08-25T21:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78955"
},
{
"type": "WEB",
"url": "https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html"
},
{
"type": "WEB",
"url": "https://issues.chromium.org/issues/514439436"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-7953-VWV9-3RQV
Vulnerability from github – Published: 2023-10-10 12:32 – Updated: 2024-04-04 08:28A vulnerability has been identified in Mendix Forgot Password (Mendix 10 compatible) (All versions < V5.4.0), Mendix Forgot Password (Mendix 7 compatible) (All versions < V3.7.3), Mendix Forgot Password (Mendix 8 compatible) (All versions < V4.1.3), Mendix Forgot Password (Mendix 9 compatible) (All versions < V5.4.0). Applications using the affected module are vulnerable to user enumeration due to distinguishable responses. This could allow an unauthenticated remote attacker to determine if a user is valid or not, enabling a brute force attack with valid users.
{
"affected": [],
"aliases": [
"CVE-2023-43623"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-10-10T11:15:12Z",
"severity": "MODERATE"
},
"details": "A vulnerability has been identified in Mendix Forgot Password (Mendix 10 compatible) (All versions \u003c V5.4.0), Mendix Forgot Password (Mendix 7 compatible) (All versions \u003c V3.7.3), Mendix Forgot Password (Mendix 8 compatible) (All versions \u003c V4.1.3), Mendix Forgot Password (Mendix 9 compatible) (All versions \u003c V5.4.0). Applications using the affected module are vulnerable to user enumeration due to distinguishable responses. This could allow an unauthenticated remote attacker to determine if a user is valid or not, enabling a brute force attack with valid users.",
"id": "GHSA-7953-vwv9-3rqv",
"modified": "2024-04-04T08:28:01Z",
"published": "2023-10-10T12:32:12Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43623"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-295483.pdf"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-46
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
- 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-189: Black Box Reverse Engineering
An adversary discovers the structure, function, and composition of a type of computer software through black box analysis techniques. 'Black Box' methods involve interacting with the software indirectly, in the absence of direct access to the executable object. Such analysis typically involves interacting with the software at the boundaries of where the software interfaces with a larger execution environment, such as input-output vectors, libraries, or APIs. Black Box Reverse Engineering also refers to gathering physical side effects of a hardware device, such as electromagnetic radiation or sounds.