CVE-2026-33525: Authelia: Improper Neutralization of Input During Web Page Generation Leads to Potential Cross-site Scripting

CVE-2026-33525 · Severity: medium · CVSS 4 · Published 2026-03-26

Authelia: Improper Neutralization of Input During Web Page Generation Leads to Potential Cross-site Scripting in github.com/authelia/authelia

Technologies: github.com/authelia/authelia (Go), github.com/authelia/authelia/v4 (Go). Vendors: Go.

Quick answers

Is CVE-2026-33525 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33525 being exploited in the wild.
How severe is CVE-2026-33525?
Medium severity, with a CVSS score of 4, published 26 March 2026.
Which products and versions are affected?
github.com/authelia/authelia (Go) SEMVER:introduced=0; github.com/authelia/authelia/v4 (Go) SEMVER:introduced=4.39.15,fixed=4.39.16.
Is there a fix for CVE-2026-33525?
Yes. github.com/authelia/authelia/v4 (Go): upgrade to 4.39.16 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33525?
Check whether you run github.com/authelia/authelia (Go) or github.com/authelia/authelia/v4 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/authelia/authelia/v4 (Go): upgrade to 4.39.16 or later
    go get github.com/authelia/authelia/v4@v4.39.16

Affected products

  • github.com/authelia/authelia (Go) SEMVER:introduced=0
  • github.com/authelia/authelia/v4 (Go) SEMVER:introduced=4.39.15,fixed=4.39.16

Identifiers

  • CVE-2026-33525
  • GHSA-gmfg-3v4q-9qr4
  • GO-2026-4818

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