PT-2026-22056 · Unknown · Parse Server

Sebastianosrt · Published 2026-02-25 · Updated 2026-03-04 · CVE-2026-27804

Positive Technologies (AI Summary)

CVSS v4.0

9.3

Critical

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Parse Server versions prior to 8.6.3 Parse Server versions prior to 9.1.1-alpha.4

Description Parse Server is susceptible to a security issue where an unauthenticated attacker can create a forged Google authentication token using alg: "none" to gain access as any user associated with a Google account, without needing their credentials. All deployments utilizing Google authentication are potentially affected. The issue stems from trusting the JWT header and using a custom key fetcher that accepted unknown key IDs.

Recommendations Versions prior to 8.6.3 should be upgraded to version 8.6.3 or later. Versions prior to 9.1.1-alpha.4 should be upgraded to version 9.1.1-alpha.4 or later. As a temporary workaround, disable Google authentication until an upgrade is possible.

Exploit

Fix

Insufficient Verification of Data Authenticity

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-345

CWE-327

Related Identifiers

BIT-PARSE-2026-27804

CVE-2026-27804

GHSA-4Q3H-VP4R-PRV2

Affected Products

Parse Server

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27804.json · Exploit
• https://github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2 · Vendor Advisory
• https://github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330 · Patch
• https://github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7 · Patch
• https://osv.dev/vulnerability/GHSA-4q3h-vp4r-prv2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27804 · Security Note
• https://osv.dev/vulnerability/BIT-parse-2026-27804 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-27804 · Vendor Advisory
• https://github.com/parse-community/parse-server/releases/tag/8.6.3 · Note
• https://github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4 · Note
• https://github.com/parse-community/parse-server · Note
• https://twitter.com/_cvereports/status/2026812030926065889 · Twitter Post
• https://twitter.com/pulsepatchio/status/2027394772063682790 · Twitter Post
• https://t.me/CVEtracker/45796 · Telegram Post
• https://twitter.com/CVEnew/status/2027004253550625030 · Twitter Post