---
title: "CVE-2026-118377: mews/pos - Authentication Bypass"
description: "mews/pos through 2.0.0 contains an insufficient verification of data authenticity vulnerability caused by skipping check3DHash() in payment handlers, letting unauthenticated attackers forge payment results by submitting unverified callbacks."
url: https://panop.io/threat-heartbeat/CVE-2026-118377/
---

# CVE-2026-118377 mews/pos - Authentication Bypass

mews/pos through 2.0.0 contains an insufficient verification of data authenticity vulnerability caused by skipping check3DHash() in payment handlers, letting unauthenticated attackers forge payment results by submitting unverified callbacks.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-118377)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-345](https://cwe.mitre.org/data/definitions/345.html)

## Vendor fix

Update to the latest version beyond 2.0.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-118377](https://nvd.nist.gov/vuln/detail/CVE-2026-118377)
- [https://github.com/mewebstudio/pos/commit/7c59d42bc49483c7c54999d757cb67055d9f732a](https://github.com/mewebstudio/pos/commit/7c59d42bc49483c7c54999d757cb67055d9f732a)
- [https://github.com/mewebstudio/pos/issues/306](https://github.com/mewebstudio/pos/issues/306)
- [https://github.com/mewebstudio/pos/pull/305](https://github.com/mewebstudio/pos/pull/305)
- [https://www.vulncheck.com/advisories/mews-pos-through-2.0.0-missing-hash-verification-in-3d-pay-and-3d-host-callbacks](https://www.vulncheck.com/advisories/mews-pos-through-2.0.0-missing-hash-verification-in-3d-pay-and-3d-host-callbacks)
- [https://github.com/mewebstudio/pos](https://github.com/mewebstudio/pos)
- [https://github.com/mewebstudio/pos/blob/50ed2bfe4f8980b8b0c47996de571943fa58d7ad/src/Gateway/InterPos.php#L134-L149](https://github.com/mewebstudio/pos/blob/50ed2bfe4f8980b8b0c47996de571943fa58d7ad/src/Gateway/InterPos.php#L134-L149)
- [https://github.com/mewebstudio/pos/blob/50ed2bfe4f8980b8b0c47996de571943fa58d7ad/src/Gateway/PayForPos.php#L135-L150](https://github.com/mewebstudio/pos/blob/50ed2bfe4f8980b8b0c47996de571943fa58d7ad/src/Gateway/PayForPos.php#L135-L150)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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