KEVIntel

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-63077

TeamCity Remote Code Execution

JetBrains / TeamCity · affected before 2026.1.3, 2025.11.7

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Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
0.6%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-63077 is an unauthenticated vulnerability affecting JetBrains TeamCity. In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol

Is it exploited?

Yes. KEVIntel tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

JetBrains / TeamCity affected before 2026.1.3, 2025.11.7.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

TeamCity Remote Code Execution

In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol

Vendor Product Affected Status
JetBrains TeamCity Before 2026.1.3, 2025.11.7 Affected
Published
27 Jul 2026
Exploitation Reported
05 Aug 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa

CVE References

Exploitation evidence

Why KEVIntel marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 05 Aug 2026

Independent exploitation attestation added to the KEVIntel record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.

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Source Added
CISA First 2026-08-05 16:50 UTC
CVE 2026-08-05 18:01 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEVIntel virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.6%

Weaknesses

Deserialization of Untrusted Data CWE-502

Recent mention · Rapid7

CVE-2026-63077: Critical unauthenticated remote code execution in JetBrains TeamCity

OverviewOn July 27, 2026, JetBrains published a security advisory for CVE-2026-63077, a critical unauthenticated vulnerability affecting all versions of TeamCity On-Premises. The issue is classified as deserialization of untrusted data and has a CVSS score of 9.8. An...

Read full advisory

All Mentions

Recent mention · Rapid7

CVE-2026-63077: Critical unauthenticated remote code execution in JetBrains TeamCity

Rapid7 · 29 Jul 2026

OverviewOn July 27, 2026, JetBrains published a security advisory for CVE-2026-63077, a critical unauthenticated vulnerability affecting all versions of TeamCity On-Premises. The issue is classified as deserialization of untrusted data and has a CVSS score of 9.8. An unauthenticated remote attacker with HTTP(S) access to a TeamCity server can exploit the agent polling protocol to bypass authentication checks and execute arbitrary operating system commands with the privileges of the TeamCity server process.In the blog post that JetBrains shared in tandem with CVE publication, they stated...

Recent mention · TheHackerNews

Critical TeamCity Flaw Could Let Attackers Run OS Commands Without Logging In

TheHackerNews · 28 Jul 2026

JetBrains is urging customers of on-premise versions of TeamCity to update to the latest version following the discovery of a critical security issue that could result in arbitrary code execution. The vulnerability, assigned CVE-2026-63077 (CVSS score: 9.8), affects all TeamCity On-Premises versions. It has been addressed in versions 2025.11.7 and 2026.1.3. TeamCity Cloud instances have already

Timeline

From disclosure to observed exploitation

  1. KEV confirmed by CVE

    Exploitation attested by an external source

  2. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. CVE published

    Vulnerability disclosed publicly

  4. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-63077

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-63077",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "epss_score": 0.00649,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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