CVE-2026-27189

Local state corruption via unsynchronized JSON writes

Published Feb 21, 2026 · Updated Feb 21, 2026

Race condition in OpenSift local JSON persistence before 1.1.3-alpha allows local users to corrupt or lose saved application state. JSON store writes for sessions, study data, quizzes, flashcards, wellness settings, and authentication lack atomic replacement and sufficient locking, so concurrent operations can overwrite updates or leave corrupted state. Exploitation requires low-privileged local access and concurrent operations; the bounded consequence is lost or corrupted locally persisted state.

CVSS severity6.6
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in OpenSift local JSON persistence before 1.1.3-alpha allows local users to corrupt or lose saved application state. JSON store writes for sessions, study data, quizzes, flashcards, wellness settings, and authentication lack atomic replacement and sufficient locking, so concurrent operations can overwrite updates or leave corrupted state. Exploitation requires low-privileged local access and concurrent operations; the bounded consequence is lost or corrupted locally persisted state.

The record

CVE
CVE-2026-27189
Published
Feb 21, 2026
Updated
Feb 21, 2026
Vendor
OpenSift
Product
OpenSift
Classifications
CWE-362, CWE-367
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.1.3-alpha

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenSift · OpenSiftversion=< 1.1.3-alpha

Published CVSS scores

6.6GitHubCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
5.8NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo