# CVE-2026-90564: quequnlong shiyi-blog stored cross-site scripting in chat

Source: https://junglewise.ai/threats/cve-2026-90564-quequnlong-shiyi-blog-stored-cross-site-scripting-in-chat  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-13. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-90564 · Severity: low · CVSS 3.5 · Published 2026-09-13

Shiyi-blog is a Vue and SpringBoot-based blogging platform with integrated chat functionality. A logged-in user can inject malicious JavaScript through the chat message endpoint, which is then stored in the database and rendered unsafely (via Vue's v-html) to other users viewing the chat history or receiving real-time messages, allowing attackers to steal session data or perform unauthorized actions on behalf of victims.

Technologies: [Quequnlong Shiyi-Blog](https://junglewise.ai/threats/technologies/shiyi-blog). Vendors: [Quequnlong](https://junglewise.ai/threats/vendors/quequnlong).

## Quick answers

**Is CVE-2026-90564 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90564 being exploited in the wild.

**How severe is CVE-2026-90564?** Low severity, with a CVSS score of 3.5, published 13 September 2026.

**Which products and versions are affected?** Quequnlong Shiyi-Blog 1.0.0 to 1.2.1.

**Is there a fix for CVE-2026-90564?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-90564 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-90564?** Check whether you run Quequnlong Shiyi-Blog at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a stored cross-site scripting (XSS) flaw in the chat message handling flow. An authenticated user submits malicious HTML/JavaScript via POST /chat/sendMsg; the ChatServiceImpl persists the content to the chat_msg table without sanitization. The frontend (chat/index.vue) then renders message content using Vue's v-html directive, which interprets the content as raw HTML. Since SysChatMsgMapper.getChatMsgList returns all global chat history without filtering and WebSocketServer broadcasts to all connected sessions, any logged-in user viewing the chat page is vulnerable to code execution. The attack requires prior authentication but can target cross-user scenarios. Current patches include only sensitive-word filtering on the backend, which does not prevent XSS; proper fixes require disabling raw HTML rendering or applying a robust HTML sanitizer at the output boundary.

## Affected products

- quequnlong shiyi-blog 1.0.0 to 1.2.1

## Timeline

- 2026-09-13: disclosed
- other: Vulnerability reported via Gitee issue IK5RVL on 2026-08-01; project has not responded

## References

- [https://gitee.com/quequnlong/shiyi-blog/](https://gitee.com/quequnlong/shiyi-blog/)
- [https://gitee.com/quequnlong/shiyi-blog/issues/IK5RVL](https://gitee.com/quequnlong/shiyi-blog/issues/IK5RVL)

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