+V15.3 Defensive Coding
---+V15.3.1 Verify that the application only returns the required subset of fields from a data object. For …
---+V15.3.2 Verify that where the application backend makes calls to external URLs, it is configured to not …
---+V15.3.3 Verify that the application has countermeasures to protect against mass assignment attacks by …
---+V15.3.4 Verify that all proxying and middleware components transfer the user's original IP address …
---+V15.3.5 Verify that the application explicitly ensures that variables are of the correct type and performs …
---+V15.3.6 Verify that JavaScript code is written in a way that prevents prototype pollution, for example, by …
---+V15.3.7 Verify that the application has defenses against HTTP parameter pollution attacks, particularly if …

V15.3 Defensive Coding

This section covers vulnerability types, including type juggling, prototype pollution, and others, which result from using insecure coding patterns in a particular language. Some may not be relevant to all languages, whereas others will have language-specific fixes or may relate to how a particular language or framework handles a feature such as HTTP parameters. It also considers the risk of not cryptographically validating application updates.

It also considers the risks associated with using objects to represent data items and accepting and returning these via external APIs. In this case, the application must ensure that data fields that should not be writable are not modified by user input (mass assignment) and that the API is selective about what data fields get returned. Where field access depends on a user's permissions, this should be considered in the context of the field-level access control requirement in the Authorization chapter.

1. Преглед

Наименование	Стандарт
V15.3.1 Verify that the application only returns the required subset of fields from a data object. For …	Verify that the application only returns the required subset of fields from a data object. For example, it should not return an entire data object, as some individual fields should not be accessible to users.
V15.3.2 Verify that where the application backend makes calls to external URLs, it is configured to not …	Verify that where the application backend makes calls to external URLs, it is configured to not follow redirects unless it is intended functionality.
V15.3.3 Verify that the application has countermeasures to protect against mass assignment attacks by …	Verify that the application has countermeasures to protect against mass assignment attacks by limiting allowed fields per controller and action, e.g., it is not possible to insert or update a field value when it was not intended to be part of that action.
V15.3.4 Verify that all proxying and middleware components transfer the user's original IP address …	Verify that all proxying and middleware components transfer the user's original IP address correctly using trusted data fields that cannot be manipulated by the end user, and the application and web server use this correct value for logging and security decisions such as rate limiting, taking into account that even the original IP address may not be reliable due to dynamic IPs, VPNs, or corporate firewalls.
V15.3.5 Verify that the application explicitly ensures that variables are of the correct type and performs …	Verify that the application explicitly ensures that variables are of the correct type and performs strict equality and comparator operations. This is to avoid type juggling or type confusion vulnerabilities caused by the application code making an assumption about a variable type.
V15.3.6 Verify that JavaScript code is written in a way that prevents prototype pollution, for example, by …	Verify that JavaScript code is written in a way that prevents prototype pollution, for example, by using Set() or Map() instead of object literals.
V15.3.7 Verify that the application has defenses against HTTP parameter pollution attacks, particularly if …	Verify that the application has defenses against HTTP parameter pollution attacks, particularly if the application framework makes no distinction about the source of request parameters (query string, body parameters, cookies, or header fields).

1.1 Препратки

1.2 Идентифицирани изисквания

1.3 Свързани регулации

2. Идентифицирани изисквания

Изисквания
Източник	Изискване

3. Свързани регулации

Регулации
Източник	Регулация

OWASP -
EN: Publications of the OWASP Foundation, https://owasp.org/. OWASP® is a registered trademark of the OWASP Foundation, Inc.; GRCA is not affiliated with, nor endorsed by, the OWASP Foundation. Only the versions published by OWASP are authoritative.
- OWASP Application Security Verification Standard (ASVS) 5.0.0, May 2025, from OWASP/ASVS: © 2008-2025 The OWASP Foundation, licensed under CC BY-SA 4.0. Changes: divided into sections and converted into the GRCA format, the wording unchanged. These adaptations are shared under CC BY-SA 4.0 as well.
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- OWASP Mobile Application Security Weakness Enumeration (MASWE) v1.0.0, August 2026, from OWASP/maswe: © The OWASP Foundation, licensed under CC BY-SA 4.0. Changes: converted into the GRCA format, the wording unchanged, linked to the MASVS controls they map to. These adaptations are shared under CC BY-SA 4.0 as well.
- OWASP Mobile Application Security Testing Guide (MASTG) v2.0.0, June 2026, from OWASP/mastg: © The OWASP Foundation, licensed under CC BY-SA 4.0. The tests and best practices only, without code samples, images, tools or apps. Changes: converted into the GRCA format, the wording unchanged; references to other pages of the MASTG as links to mas.owasp.org; the weakness of each test in the numbering of MASWE v1 and linked to it. These adaptations are shared under CC BY-SA 4.0 as well.
- OWASP Software Assurance Maturity Model (SAMM) v2.2.0, July 2026, from owaspsamm/core: © The OWASP Foundation, licensed under CC BY-SA 4.0. Changes: converted into the GRCA format, the wording unchanged; short codes (G-SM-1-A) built from the model, the assessment questions as assessment procedures of their activities. These adaptations are shared under CC BY-SA 4.0 as well.
- OWASP Top 10:2025, from OWASP/Top10: © 2003-2025 The OWASP® Foundation, Inc., licensed under CC BY-SA 4.0. The ten categories, without the icons. Changes: converted into the GRCA format, the wording unchanged. These adaptations are shared under CC BY-SA 4.0 as well. The names of the mapped CWEs (Common Weakness Enumeration): © 2006–2026 The MITRE Corporation. License: The MITRE Corporation hereby grants you a non-exclusive, royalty-free license to use CWE for research, development, and commercial purposes. Any copy you make for such purposes is authorized on the condition that you reproduce MITRE’s copyright designation and this license in any such copy. See the CWE Terms of Use. CWE™ is a trademark of The MITRE Corporation.
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- OWASP Application Security Verification Standard (ASVS) 5.0.0, Mai 2025, aus OWASP/ASVS: © 2008-2025 The OWASP Foundation, lizenziert unter CC BY-SA 4.0. Änderungen: in Abschnitte aufgeteilt und in das GRCA-Format umgewandelt, der Wortlaut unverändert. Diese Bearbeitungen stehen ebenfalls unter CC BY-SA 4.0.
- OWASP Mobile Application Security Verification Standard (MASVS) v2.1.0, Januar 2024, aus OWASP/masvs: © The OWASP Foundation, lizenziert unter CC BY-SA 4.0. Änderungen: in das GRCA-Format umgewandelt, der Wortlaut unverändert. Diese Bearbeitungen stehen ebenfalls unter CC BY-SA 4.0.
- OWASP Mobile Application Security Weakness Enumeration (MASWE) v1.0.0, August 2026, aus OWASP/maswe: © The OWASP Foundation, lizenziert unter CC BY-SA 4.0. Änderungen: in das GRCA-Format umgewandelt, der Wortlaut unverändert, mit den MASVS-Controls verknüpft, denen sie zugeordnet sind. Diese Bearbeitungen stehen ebenfalls unter CC BY-SA 4.0.
- OWASP Mobile Application Security Testing Guide (MASTG) v2.0.0, Juni 2026, aus OWASP/mastg: © The OWASP Foundation, lizenziert unter CC BY-SA 4.0. Nur die Tests und Best Practices, ohne Codebeispiele, Bilder, Werkzeuge und Apps. Änderungen: in das GRCA-Format umgewandelt, der Wortlaut unverändert; Verweise auf andere Seiten des MASTG als Links zu mas.owasp.org; die Schwachstelle jedes Tests in der Nummerierung der MASWE v1 und mit ihr verknüpft. Diese Bearbeitungen stehen ebenfalls unter CC BY-SA 4.0.
- OWASP Software Assurance Maturity Model (SAMM) v2.2.0, Juli 2026, aus owaspsamm/core: © The OWASP Foundation, lizenziert unter CC BY-SA 4.0. Änderungen: in das GRCA-Format umgewandelt, der Wortlaut unverändert; Kürzel (G-SM-1-A) aus dem Modell gebildet, die Assessment-Fragen als Prüfverfahren ihrer Aktivitäten. Diese Bearbeitungen stehen ebenfalls unter CC BY-SA 4.0.
- OWASP Top 10:2025, aus OWASP/Top10: © 2003-2025 The OWASP® Foundation, Inc., lizenziert unter CC BY-SA 4.0. Die zehn Kategorien, ohne die Symbole. Änderungen: in das GRCA-Format umgewandelt, der Wortlaut unverändert. Diese Bearbeitungen stehen ebenfalls unter CC BY-SA 4.0. Die Namen der zugeordneten CWEs (Common Weakness Enumeration): © 2006–2026 The MITRE Corporation. MITRE erlaubt die Nutzung für Forschung, Entwicklung und kommerzielle Zwecke, wenn jede Kopie den Urheberrechtsvermerk und die Lizenz enthält; maßgeblich ist der englische Wortlaut der Lizenz oben und die CWE Terms of Use. CWE™ ist eine Marke der MITRE Corporation.