CVE-2026-25543 is a medium-severity cross-site scripting (XSS) vulnerability affecting HtmlSanitizer, a .NET library designed to clean HTML. Prior to versions 9.0.892 and 9.1.893-beta, the library failed to sanitize the contents of the 'template' tag, which could be exploited if the 'shadowrootmode' attribute was set. This vulnerability has a CVSS score of 6.1, indicating a network-based attack requiring user interaction, with potential for low impact on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 9.0.892CPE matchmatch criteria | cpe:2.3:a:htmlsanitizer_project:htmlsanitizer:*:*:*:*:*:*:*:* | ||
>= 9.1.878, < 9.1.893CPE matchmatch criteria | cpe:2.3:a:htmlsanitizer_project:htmlsanitizer:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.