How severe is CVE-2026-33409?

CVE-2026-33409 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-33409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33409?

CVE-2026-33409 primarily affects Parseplatform Parse-server. In total, 41 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-33409?

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

Does CVE-2026-33409 have an EU (EUVD) identifier?

Yes. CVE-2026-33409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14966.

When was CVE-2026-33409 published?

CVE-2026-33409 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-33409

CVE-2026-33409 is a critical-severity vulnerability in Parseplatform Parse-server with a CVSS 3.x base score of 9.1. 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: Critical (CVSS 3.x base score 9.1)
CVSS v4: 7.0
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14966
Weakness: CWE-287
Affected product: Parseplatform Parse-server
Published: 2026-03-24
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 versions 8.6.52 and 9.6.0-alpha.41, an authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token. This affects Parse Server deployments where the server option allowExpiredAuthDataToken is set to true. The default value is false. This issue has been patched in versions 8.6.52 and 9.6.0-alpha.41.

Frequently asked questions

What is CVE-2026-33409?: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.52 and 9.6.0-alpha.41, an authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token. This affects Parse Server deployments where the server option allowExpiredAuthDataToken is set to true. The default value is false. This issue has been patched in versions 8.6.52 and 9.6.0-alpha.41.
How severe is CVE-2026-33409?: CVE-2026-33409 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-33409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33409?: CVE-2026-33409 primarily affects Parseplatform Parse-server. In total, 41 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-33409?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-33409 have an EU (EUVD) identifier?: Yes. CVE-2026-33409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14966.
When was CVE-2026-33409 published?: CVE-2026-33409 was published on 2026-03-24 and last updated on 2026-06-17.

References

Affected products (41)

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha10:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha11:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha12:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha13:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha14:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha15:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha16:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha17:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha18:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha19:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha20:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha21:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha22:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha23:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha24:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha25:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha26:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha27:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha28:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha29:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha3:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha30:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha31:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha32:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha33:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha34:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha35:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha36:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha37:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha38:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha39:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha4:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha40:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha5:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha6:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha7:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha8:*:*:*:node.js:*:*

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