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CVE-2026-42849

Goauthentik Authentik cross-site scripting (XSS)

9.3 CRITICALEPSS 0.47%
  1. Published2 Jun 2026

Description

authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, due to the implementation of stages in the SFE (Simple Flow Executor) in order to make the interface more compatible with legacy browsers, it was possible to use an XSS exploit in the AutosubmitStage. This issue has been patched in versions 2025.12.5 and 2026.2.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

Goauthentik Authentik≥ 2026.2.0 < 2026.2.3 · < 2025.12.5

Remediation

Fixed in
Goauthentik Authentik≥ 2026.2.3

References

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Frequently asked

Is CVE-2026-42849 being actively exploited?

CVE-2026-42849 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.47%.

How severe is CVE-2026-42849?

CVE-2026-42849 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2026-42849?

Affected products include Goauthentik Authentik.

How do I fix CVE-2026-42849?

Upgrade affected software to a fixed version, for example Goauthentik Authentik 2026.2.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42849 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.