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

Source: https://junglewise.ai/threats/cve-2026-33525-authelia-improper-neutralization-of-input-during-web-page  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-26  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/github-com-authelia-authelia), [github.com/authelia/authelia/v4 (Go)](https://junglewise.ai/threats/technologies/github-com-authelia-authelia-v4). Vendors: [Go](https://junglewise.ai/threats/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

  ```sh
  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

## Related threats

- [Authelia incorrect authorization via improper domain canonicalization](https://junglewise.ai/threats/cve-2026-48794-authelia-incorrect-authorization-via-improper-domain)
- [Authelia improper username canonicalization in Basic Auth](https://junglewise.ai/threats/cve-2026-47203-authelia-improper-username-canonicalization-in-basic-auth)
- [Authelia applies regulation separately to Username-based logins to Email-based logins](https://junglewise.ai/threats/cve-2025-24806-authelia-applies-regulation-separately-to-username-based-logins)
- [GO-2024-2744 - Access control change may take longer than expected in github.com/authelia/authelia/v4](https://junglewise.ai/threats/go-2024-2744-access-control-change-may-take-longer-than-expected-in-55e6475c)
- [Authelia's Group Changes may not have the expected results (YAML file backend)](https://junglewise.ai/threats/authelia-s-group-changes-may-not-have-the-expected-results-yaml-file-ece9a78e)