XSS in Fastgpt
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Fastgpt
- Labring Fastgpt — versions < 4.9.12
Weakness classification (CWE)
References
- github.com/labring/FastGPT/security/advisories/GHSA-r976-rfrv-q24m (Exploit, Vendor Advisory)
- github.com/labring/FastGPT/commit/095b75ee27746004106eddeaa4840688a61ff6eb (Patch)
Frequently asked questions
- What is CVE-2025-52552?
- CVE-2025-52552 is a medium-severity vulnerability in Fastgpt, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-06-21.
- How severe is CVE-2025-52552?
- Medium severity. CVSS v3 base score is 6.1 out of 10.