CVE-2026-27953 Vulnerability Analysis & Exploit Details

CVE-2026-27953
Vulnerability Scoring

7.1

/10

Very High Risk

Highly exploitable, CVE-2026-27953 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2026-27953 Details

Status: Analyzed

Last updated: 🕤 27 Mar 2026, 21:48 UTC
Originally published on: 🕘 19 Mar 2026, 21:17 UTC

Time between publication and last update: 8 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

CVE-2026-27953 Vulnerability Summary

CVE-2026-27953: ormar is a async mini ORM for Python. Versions 0.23.0 and below are vulnerable to Pydantic validation bypass through the model constructor, allowing any unauthenticated user to skip all field validation by injecting "__pk_only__": true into a JSON request body. By injecting "__pk_only__": true into a JSON request body, an unauthenticated attacker can skip all field validation and persist unvalidated data directly to the database. A secondary __excluded__ parameter injection uses the same pattern to selectively nullify arbitrary model fields (e.g., email or role) during construction. This affects ormar's canonical FastAPI integration pattern recommended in its official documentation, enabling privilege escalation, data integrity violations, and business logic bypass in any application using ormar.Model directly as a request body parameter. This issue has been fixed in version 0.23.1.

Assessing the Risk of CVE-2026-27953

Access Complexity Graph

The exploitability of CVE-2026-27953 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-27953

CVE-2026-27953 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-27953, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-27953, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2026-27953 has no significant impact on data confidentiality.
Integrity: High
CVE-2026-27953 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: Low
CVE-2026-27953 may slightly degrade system performance without fully affecting service availability.

CVE-2026-27953 References

External References

CWE Common Weakness Enumeration

CWE-915

Vulnerable Configurations

cpe:2.3:a:collerek:ormar:0.3.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.6:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.6:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.7:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.7:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.8:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.8:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.9:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.9:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.10:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.10:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.11:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.3.11:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.4.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.5.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.6.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.6.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.6.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.6.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.6.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.6.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.7.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.8.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.8.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.8.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.8.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.6:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.6:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.7:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.7:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.8:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.8:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.9:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.9.9:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.4:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.5:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.6:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.6:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.7:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.7:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.8:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.8:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.9:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.9:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.10:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.10:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.11:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.11:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.12:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.12:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.13:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.13:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.14:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.14:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.15:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.15:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.16:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.16:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.17:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.17:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.18:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.18:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.19:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.19:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.20:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.20:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.21:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.21:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.22:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.22:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.23:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.23:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.24:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.24:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.25:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.10.25:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.11.3:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.12.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.12.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.12.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.12.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.12.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.12.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.0:-:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.0:-:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.0:beta1:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.0:beta1:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.1:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.20.2:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.21.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.21.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.22.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.22.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.23.0:*:*:*:*:python:*:*
cpe:2.3:a:collerek:ormar:0.23.0:*:*:*:*:python:*:*

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