# CVE-2026-19895: OpenSourcePOS missing brute-force protection on login endpoint

Source: https://junglewise.ai/threats/cve-2026-19895-opensourcepos-missing-brute-force-protection-on-login-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-15. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-19895 · Severity: low · CVSS 3.7 · Published 2026-08-15

OpenSourcePOS is a point-of-sale system used in retail and hospitality to manage sales, inventory, and employee access. The login endpoint lacks rate limiting and account lockout mechanisms, allowing attackers to conduct unlimited credential-guessing attacks against employee accounts. When reCAPTCHA is enabled (not default), the CAPTCHA validation occurs after password verification, creating a security flaw where incorrect passwords never trigger CAPTCHA protection and error messages leak whether a username exists—enabling attackers to enumerate valid credentials without solving any challenge.

Technologies: [Opensourcepos Open Source Point of Sale](https://junglewise.ai/threats/technologies/open-source-point-of-sale). Vendors: [Opensourcepos](https://junglewise.ai/threats/vendors/opensourcepos).

## Quick answers

**Is CVE-2026-19895 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19895 being exploited in the wild.

**How severe is CVE-2026-19895?** Low severity, with a CVSS score of 3.7, published 15 August 2026.

**Which products and versions are affected?** Opensourcepos Open Source Point of Sale up to 3.4.2.

**Is there a fix for CVE-2026-19895?** A patch was published on 2026-07-12: Fix committed in fork purnadika/opensourcepos at 851fc32 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-19895 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-19895?** Check whether you run Opensourcepos Open Source Point of Sale at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is classified as CWE-307 (Improper Restriction of Excessive Authentication Attempts). The Login::index() controller in app/Controllers/Login.php applies only a single custom validation rule (login_check) to submitted credentials with no failed-attempt counter, temporary/permanent account lockout, or per-IP rate limiting. The /login endpoint is excluded from CSRF protection by default (app/Config/Filters.php), allowing unauthenticated credential-guessing POST requests. Google reCAPTCHA is the only optional mitigation but is disabled by default. When reCAPTCHA is enabled, the password is verified before CAPTCHA validation occurs (app/Models/Employee.php::login()), so incorrect passwords never consume a CAPTCHA token. Additionally, distinct error responses ('invalid_username_and_password' vs 'invalid_gcaptcha') create an oracle allowing attackers to determine the correct password by observing which error is returned. Patches have been committed to fix these issues.

## Affected products

- opensourcepos Open Source Point of Sale up to 3.4.2

## Timeline

- 2026-08-15: disclosed
- 2026-07-12: patched: Fix committed in fork purnadika/opensourcepos at 851fc32

## References

- [https://github.com/opensourcepos/opensourcepos/issues/4583](https://github.com/opensourcepos/opensourcepos/issues/4583)
- [https://github.com/purnadika/opensourcepos/commit/851fc323e517e798b3872a2fa54d2923b85fe04c](https://github.com/purnadika/opensourcepos/commit/851fc323e517e798b3872a2fa54d2923b85fe04c)

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