Vulnerability in Mewebstudio Pos
CVE-2026-118377
mews/pos through 2.0.0 contains an insufficient verification of data authenticity vulnerability that allows unauthenticated attackers to forge payment results by submitting unverified callbacks. GarantiPos, PayForPos and InterPos 3D Pay and 3D Host handlers skip check3DHash(), letting attackers post tampered status, amount or order ID fields to complete orders without paying.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/mewebstudio/pos/pull/305 (issue-tracking, patch)
- github.com/mewebstudio/pos/commit/7c59d42bc49483c7c54999d757cb67055d9f732a (patch)
- github.com/mewebstudio/pos/issues/306 (issue-tracking)
- github.com/mewebstudio/pos/blob/50ed2bfe4f8980b8b0c47996de571943fa58d7ad/src/Ga… (technical-description)
- github.com/mewebstudio/pos/blob/50ed2bfe4f8980b8b0c47996de571943fa58d7ad/src/Ga… (technical-description)
- github.com/mewebstudio/pos (product)
- www.vulncheck.com/advisories/mews-pos-through-2.0.0-missing-hash-verification-i… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-118377?
- CVE-2026-118377 is a high-severity vulnerability in Mewebstudio Pos, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2026-10-28.
- How severe is CVE-2026-118377?
- High severity. CVSS v3 base score is 7.5 out of 10.