Secuno
ENNL
Book demo

CVE-2026-27804

Parseplatform Parse-server vulnerability

9.1 CRITICALEPSS 0.23%
  1. Published25 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Parseplatform Parse-server9.3.1 · ≥ 9.0.0 < 9.3.1 · < 8.6.3

Remediation

Fixed in
Parseplatform Parse-server≥ 9.3.1

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1089719.6
A flaw has been found in D-Link DCS-930L B1.08B4. This impacts the function mpfd_decode…
CVE-2026-1040569.8
Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata…
CVE-2026-892389.1
WSS4J EncryptedHeader child confusion could promote an attacker-controlled plaintext…
CVE-2026-1028318.1
JupyterLab is an extensible environment for interactive and reproducible computing,…
CVE-2026-921619.8
FriendsOfFlarum OAuth allows users to log in to Flarum with GitHub, Twitter, Facebook,…
CVE-2026-816308.1
The Botslab G980H dash camera firmware does not adequately verify the authenticity of…

Frequently asked

Is CVE-2026-27804 being actively exploited?

CVE-2026-27804 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.23%.

How severe is CVE-2026-27804?

CVE-2026-27804 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.23% probability of exploitation.

Which products are affected by CVE-2026-27804?

Affected products include Parseplatform Parse-server.

How do I fix CVE-2026-27804?

Upgrade affected software to a fixed version, for example Parseplatform Parse-server 9.3.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27804 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.