Is CVE-2026-27804 actively exploited?

No active exploitation of CVE-2026-27804 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27804 be exploited remotely?

Yes. CVE-2026-27804 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27804?

CVE-2026-27804 has a CVSS score of 9.1 (CRITICAL) and an EPSS exploitation probability of 0.04%.

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CRITICAL

CVE-2026-27804

CWE-327Published: February 26, 2026· Updated: Mar 4, 2026

9.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.3 and 9.1.1-alpha.4, an unauthenticated attacker can forge a Google authentication token with `alg: "none"` to log in as any user linked to a Google account, without knowing their credentials. All deployments with Google authentication enabled are affected. The fix in versions 8.6.3 and 9.1.1-alpha.4 hardcodes the expected `RS256` algorithm instead of trusting the JWT header, and replaces the Google adapter's custom key fetcher with `jwks-rsa` which rejects unknown key IDs. As a workaround, dsable Google authentication until upgrading is possible.

NVD Source

Technical Analysis

CVE-2026-27804 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.