CVE-2025-15104 describes a restriction bypass in The Nu Html Checker (validator.nu), affecting its latest version. This vulnerability allows remote attackers to force the server to make arbitrary HTTP/HTTPS requests to internal resources, including localhost services, by bypassing hostname-based protections through DNS rebinding or loopback-resolving domains. Rated 5.3 MEDIUM (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N), it has a low attack complexity and no user interaction required, potentially leading to information disclosure. There is no evidence of active exploitation, and no public exploit code (Metasploit, Nuclei, ExploitDB) is available, though it has garnered significant community discussion with 10 mentions.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2026-01-11CPE matchmatch criteria | cpe:2.3:a:validator:validator:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.