How severe is CVE-2026-30949?

CVE-2026-30949 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-30949 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30949?

CVE-2026-30949 primarily affects Parseplatform Parse-server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-30949?

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-2026-30949 have an EU (EUVD) identifier?

Yes. CVE-2026-30949 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10868.

When was CVE-2026-30949 published?

CVE-2026-30949 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-30949

CVE-2026-30949 is a high-severity vulnerability in Parseplatform Parse-server with a CVSS 3.x base score of 8.8. 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-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 7.6
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10868
Weakness: CWE-287
Affected product: Parseplatform Parse-server
Published: 2026-03-10
Last modified: 2026-06-17

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.5 and 8.6.18, the Keycloak authentication adapter does not validate the azp (authorized party) claim of Keycloak access tokens against the configured client-id. A valid access token issued by the same Keycloak realm for a different client application can be used to authenticate as any user on the Parse Server that uses the Keycloak adapter. This enables cross-application account takeover in multi-client Keycloak realms. All Parse Server deployments that use the Keycloak authentication adapter with a Keycloak realm that has multiple client applications are affected. This vulnerability is fixed in 9.5.2-alpha.5 and 8.6.18.

Frequently asked questions

What is CVE-2026-30949?: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.5 and 8.6.18, the Keycloak authentication adapter does not validate the azp (authorized party) claim of Keycloak access tokens against the configured client-id. A valid access token issued by the same Keycloak realm for a different client application can be used to authenticate as any user on the Parse Server that uses the Keycloak adapter. This enables cross-application account takeover in multi-client Keycloak realms. All Parse Server deployments that use the Keycloak authentication adapter with a Keycloak realm that has multiple client applications are affected. This vulnerability is fixed in 9.5.2-alpha.5 and 8.6.18.
How severe is CVE-2026-30949?: CVE-2026-30949 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-30949 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30949?: CVE-2026-30949 primarily affects Parseplatform Parse-server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-30949?: 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-2026-30949 have an EU (EUVD) identifier?: Yes. CVE-2026-30949 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10868.
When was CVE-2026-30949 published?: CVE-2026-30949 was published on 2026-03-10 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha3:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha4:*:*:*:node.js:*:*

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