CVE-2026-33525 identifies a Cross-site Scripting (XSS) vulnerability in Authelia version 4.39.15, stemming from insufficient neutralization of the `language` cookie value on the login page. This is a low-severity issue (CVSS 0.5) with high attack complexity, as exploitation requires an attacker on an adjacent network and specific, unsafe modifications to the Content Security Policy (CSP) directives. The default CSP configuration completely prevents exploitation, meaning the overwhelming majority of installations are unaffected and impact is minimal. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
4.39.15CPE matchmatch criteria | cpe:2.3:a:authelia:authelia:4.39.15:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/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.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.