How severe is CVE-2026-41577?

CVE-2026-41577 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-41577 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41577?

CVE-2026-41577 affects Goauthentik Authentik. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41577?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-41577 have an EU (EUVD) identifier?

Yes. CVE-2026-41577 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33987.

When was CVE-2026-41577 published?

CVE-2026-41577 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-41577

CVE-2026-41577 is a high-severity vulnerability in Goauthentik Authentik with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.9
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33987
Weakness: CWE-345
Affected product: Goauthentik Authentik
Published: 2026-06-02
Last modified: 2026-06-17

Description

authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, the SAML source response processor (ResponseProcessor.parse()) does not validate the Conditions element on assertions. NotBefore, NotOnOrAfter, and AudienceRestriction are all ignored. This allows replay of expired assertions and acceptance of assertions intended for other service providers. This issue has been patched in versions 2025.12.5 and 2026.2.3.

Frequently asked questions

What is CVE-2026-41577?: authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, the SAML source response processor (ResponseProcessor.parse()) does not validate the Conditions element on assertions. NotBefore, NotOnOrAfter, and AudienceRestriction are all ignored. This allows replay of expired assertions and acceptance of assertions intended for other service providers. This issue has been patched in versions 2025.12.5 and 2026.2.3.
How severe is CVE-2026-41577?: CVE-2026-41577 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-41577 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41577?: CVE-2026-41577 affects Goauthentik Authentik. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41577?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-41577 have an EU (EUVD) identifier?: Yes. CVE-2026-41577 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33987.
When was CVE-2026-41577 published?: CVE-2026-41577 was published on 2026-06-02 and last updated on 2026-06-17.

References

https://github.com/goauthentik/authentik/security/advisories/GHSA-4v4x-x5pr-8gp2

Affected products (1)

cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*

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