CVE-2025-56515: fiora XSS — Exploit

Description

File upload vulnerability in Fiora chat application 1.0.0 through user avatar upload functionality. The application fails to validate SVG file content, allowing malicious SVG files with embedded foreignObject elements containing iframe tags and JavaScript event handlers (onmouseover) to be uploaded and stored. When rendered, these SVG files execute arbitrary JavaScript, enabling attackers to steal user sessions, cookies, and perform unauthorized actions in the context of users viewing affected profiles.

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CVSS v3.1 Score

8.8

HIGH

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

CWE-434 Unrestricted Upload

Affected Products

Vendor	Product	Versions
suisuijiang	fiora	All

References

Exploits

https://github.com/Kov404/CVE-2025-56515/tree/main

Other References

https://fiora.suisuijiang.com/ https://github.com/yinxin630/fiora

Frequently Asked Questions

What is CVE-2025-56515? +

File upload vulnerability in Fiora chat application 1.0.0 through user avatar upload functionality. The application fails to validate SVG file content, allowing malicious SVG files with embedded foreignObject elements containing iframe tags and JavaScript event handlers (onmouseover) to be uploaded and stored. When rendered, these SVG files execute arbitrary JavaScript, enabling attackers to steal user sessions, cookies, and perform unauthorized actions in the context of users viewing affected profiles. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-56515? +

CVE-2025-56515 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-56515? +

CVE-2025-56515 affects products from suisuijiang, specifically: fiora. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-56515? +

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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CVE-2025-56515