CVE-2026-10283: DaybydayCRM Authentication Bypass Flaw

CVE-2026-10283 Overview

CVE-2026-10283 is a missing authentication vulnerability in Bottelet DaybydayCRM versions up to 2.2.1. The flaw resides in an unspecified function of the Setting Handler component. Attackers can manipulate this component remotely without providing valid credentials. The issue is classified under [CWE-287] Improper Authentication.

DaybydayCRM is an open-source customer relationship management application used by small and mid-sized businesses to manage clients, projects, and invoices. Exposure of configuration endpoints without authentication enables remote actors to influence application settings over the network.

Critical Impact
Remote attackers with low privileges can interact with the Setting Handler component without proper authentication, potentially altering application configuration and affecting confidentiality, integrity, and availability of the CRM instance.

Affected Products

Bottelet DaybydayCRM versions up to and including 2.2.1
Setting Handler component of DaybydayCRM
Self-hosted deployments of DaybydayCRM exposed to untrusted networks

Discovery Timeline

2026-06-01 - CVE-2026-10283 published to the National Vulnerability Database
2026-06-02 - Last updated in NVD database

Technical Details for CVE-2026-10283

Vulnerability Analysis

The vulnerability is an authentication weakness in the Setting Handler component of DaybydayCRM. The handler exposes functionality that should be restricted to authenticated administrative users but fails to enforce authentication checks before processing requests. As a result, a remote actor can issue requests to the affected endpoint and trigger setting manipulation without supplying valid credentials.

The CWE-287 classification confirms that the root issue is improper authentication rather than authorization or input validation. The vulnerability falls into the Authentication Bypass category. According to the Exploit Prediction Scoring System, the current probability of exploitation activity remains low, and no public exploit code has been published at the time of writing.

Root Cause

The Setting Handler accepts and processes requests without validating the requester's identity or session state. Missing middleware or guard logic on the affected route allows the handler to act on inputs supplied by unauthenticated parties. The associated GitHub Pull Request #363 addresses the missing authentication enforcement.

Attack Vector

The attack vector is network-based. An attacker reaches the vulnerable Setting Handler endpoint over HTTP or HTTPS exposed by the DaybydayCRM deployment. Exploitation does not require user interaction. Because authentication is not enforced, the attacker can submit crafted requests directly to the handler to manipulate settings or trigger affected logic paths.

No verified proof-of-concept code is publicly available. Technical context is documented in GitHub Issue #348 and VulDB CVE-2026-10283.

Detection Methods for CVE-2026-10283

Indicators of Compromise

Unauthenticated HTTP requests to DaybydayCRM setting-related routes originating from unexpected source addresses
Unexpected modifications to application settings, integrations, or notification configurations recorded in audit logs
New or altered administrative configuration values without a corresponding authenticated session in web server logs

Detection Strategies

Compare current DaybydayCRM configuration values against a known-good baseline to surface unauthorized changes
Inspect web server and application logs for requests targeting setting endpoints that lack a valid authenticated session cookie or token
Correlate configuration-change events with source IP addresses and geolocation to identify anomalous activity

Monitoring Recommendations

Enable verbose access logging on the web server fronting DaybydayCRM and forward logs to a centralized analytics platform
Alert on HTTP 200 responses to setting-related URIs when the request lacks an authenticated session
Track changes to the DaybydayCRM database tables that store application settings and notify administrators on writes outside maintenance windows

How to Mitigate CVE-2026-10283

Immediate Actions Required

Apply the upstream fix from GitHub Pull Request #363 or upgrade to a version of DaybydayCRM that incorporates the patch
Restrict network access to the DaybydayCRM application so the Setting Handler is reachable only from trusted administrative networks or via VPN
Review recent configuration changes for unauthorized modifications and revert any unexpected values

Patch Information

The maintainers addressed the missing authentication issue through changes tracked in GitHub Pull Request #363 against the Bottelet/DaybydayCRM repository. Administrators running versions up to 2.2.1 should update to a release that includes this fix. Additional cross-references are available at VulDB Vulnerability #367576.

Workarounds

Place DaybydayCRM behind a reverse proxy that enforces authentication or IP allow-listing in front of setting-related routes
Apply web application firewall rules to block unauthenticated requests to the Setting Handler endpoint until the patch is deployed
Disable external exposure of the administrative interface and require access through a bastion host or VPN

bash

# Example nginx snippet restricting setting routes to a trusted CIDR
location ~* /settings {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://daybydaycrm_backend;
}