# CVE-2026-53914 — JetBrains Kotlin

> As of 2026-06-27, CVE-2026-53914 is a MEDIUM-severity vulnerability in JetBrains Kotlin, CVSS v3.1 6.7, EPSS 0.1% (9.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-53914, most recently “Multiple JetBrains Product Vulnerabilities: Account Takeover, Privilege Escalation, and RCE Across Hub, YouTrack, IntelliJ IDEA, Kotlin, GoLand, and TeamCity”.

**Last updated:** 2026-06-27

## What is CVE-2026-53914?

In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata

The record classifies CVE-2026-53914 under weakness class [CWE-502](https://intel.threadlinqs.com/cwe/CWE-502). Its CVSS v3 base vector states that the flaw requires local access to the host, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 101 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.7 — MEDIUM (`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 9.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-26, last modified 2026-06-27

## Is CVE-2026-53914 being exploited?

No public exploitation evidence for CVE-2026-53914 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-06-27. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- [JetBrains](https://intel.threadlinqs.com/vendors/jetbrains): Kotlin

## How to fix CVE-2026-53914

No vendor patch reference has been recorded for CVE-2026-53914 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-53914

1 tracked threat in the Threadlinqs corpus references CVE-2026-53914, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Multiple JetBrains Product Vulnerabilities: Account Takeover, Privilege Escalation, and RCE Across Hub, YouTrack, IntelliJ IDEA, Kotlin, GoLand, and TeamCity](https://intel.threadlinqs.com/threat/TL-2026-1069) — HIGH · 2026-07-02

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-02.

**Other references**

- [jetbrains.com](https://www.jetbrains.com/privacy-security/issues-fixed/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-53914
Full detection coverage and IOCs for threats exploiting CVE-2026-53914 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp