How severe is CVE-2026-40948?

CVE-2026-40948 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-40948 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40948?

CVE-2026-40948 affects Apache Apache-airflow-providers-keycloak. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40948?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40948 have an EU (EUVD) identifier?

Yes. CVE-2026-40948 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23676.

When was CVE-2026-40948 published?

CVE-2026-40948 was published on 2026-04-18 and last updated on 2026-06-17.

CVE-2026-40948

CVE-2026-40948 is a medium-severity vulnerability in Apache Apache-airflow-providers-keycloak with a CVSS 3.x base score of 5.4. 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23676
Weakness: CWE-352
Affected product: Apache Apache-airflow-providers-keycloak
Published: 2026-04-18
Last modified: 2026-06-17

Description

The Keycloak authentication manager in `apache-airflow-providers-keycloak` did not generate or validate the OAuth 2.0 `state` parameter on the login / login-callback flow, and did not use PKCE. An attacker with a Keycloak account in the same realm could deliver a crafted callback URL to a victim's browser and cause the victim to be logged into the attacker's Airflow session (login-CSRF / session fixation), where any credentials the victim subsequently stored in Airflow Connections would be harvestable by the attacker. Users are advised to upgrade `apache-airflow-providers-keycloak` to 0.7.0 or later.

Frequently asked questions

What is CVE-2026-40948?: The Keycloak authentication manager in `apache-airflow-providers-keycloak` did not generate or validate the OAuth 2.0 `state` parameter on the login / login-callback flow, and did not use PKCE. An attacker with a Keycloak account in the same realm could deliver a crafted callback URL to a victim's browser and cause the victim to be logged into the attacker's Airflow session (login-CSRF / session fixation), where any credentials the victim subsequently stored in Airflow Connections would be harvestable by the attacker. Users are advised to upgrade `apache-airflow-providers-keycloak` to 0.7.0 or later.
How severe is CVE-2026-40948?: CVE-2026-40948 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-40948 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40948?: CVE-2026-40948 affects Apache Apache-airflow-providers-keycloak. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40948?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40948 have an EU (EUVD) identifier?: Yes. CVE-2026-40948 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23676.
When was CVE-2026-40948 published?: CVE-2026-40948 was published on 2026-04-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:apache-airflow-providers-keycloak:*:*:*:*:*:*:*:*

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