CVE-2025-52552: fastgpt XSS — Exploit & Fix

Description

FastGPT is an AI Agent building platform. Prior to version 4.9.12, the LastRoute Parameter on login page is vulnerable to open redirect and DOM-based XSS. Improper validation and lack of sanitization of this parameter allows attackers execute malicious JavaScript or redirect them to attacker-controlled sites. This issue has been patched in version 4.9.12.

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CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

CWE-601 CWE-601

Affected Products

Vendor	Product	Versions
fastgpt	fastgpt	< 4.9.12

References

Advisories & Patches

https://github.com/labring/FastGPT/commit/095b75ee27746004106eddeaa4840688a61ff6eb https://github.com/labring/FastGPT/security/advisories/GHSA-r976-rfrv-q24m

Exploits

https://github.com/labring/FastGPT/security/advisories/GHSA-r976-rfrv-q24m

Frequently Asked Questions

What is CVE-2025-52552? +

FastGPT is an AI Agent building platform. Prior to version 4.9.12, the LastRoute Parameter on login page is vulnerable to open redirect and DOM-based XSS. Improper validation and lack of sanitization of this parameter allows attackers execute malicious JavaScript or redirect them to attacker-controlled sites. This issue has been patched in version 4.9.12. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-52552? +

CVE-2025-52552 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-52552? +

CVE-2025-52552 affects products from fastgpt, specifically: fastgpt. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-52552? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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