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CVE-2026-63077

CRITICAL 9.8 KNOWN EXPLOITED PoC AVAILABLE

Published 2026-07-27 · Last modified 2026-08-06

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

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-08-05. Patch or mitigate now.

Exploitation likelihood

10.7%chance of exploitation in 30 days · 95th percentile

● In CISA KEV (2026-08-05) ● Public exploit / PoC

Impact if exploited

9.8CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

nuclei -id CVE-2026-63077 -u https://TARGETDetection template — non-destructive check that a target is affected.
curl -s https://vulnpedia.com/cve/CVE-2026-63077/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-63077/poc.json

Affected

Vendors Jetbrains

Products Teamcity

Weakness (CWE)

  • CWE-502: Deserialization of untrusted data

CVSS vector

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

Known Affected Software Configurations

VendorProductVersion range
JetbrainsTeamcity< 2025.11.7
JetbrainsTeamcity≥ 2026.1 and < 2026.1.3

All CVSS metrics

  • CRITICAL 9.8 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Sources: NVD · CVE.org · EPSS