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CVE-2026-63077· NVD / CVE Program· CNA JetBrains

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

CriticalCVSS 9.8 · v3.1KEVWeaponized Fix available
Published
Jul 27, 2026
Updated
Sep 23, 2026
EPSS
89.6% · 100th percentile
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Action score

96

Now

Patch today or shut off access.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
27 / 30 · 89.6%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · JetBrains
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Aug 5, 2026. That signals real attacks, not theory.

Remediation deadline for government agencies: Aug 8, 2026.

Known to be used in ransomware campaigns.

Affected systems

VendorProduct
jetbrainsteamcity

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • jetbrains teamcitybefore 2025.11.7
  • jetbrains teamcity2026.1 and later · before 2026.1.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (JetBrains). Independent of NVD's CPE analysis and usually ahead of it.

  • JetBrains TeamCity

    • before 2026.1.3, 2025.11.7affected · semver

Same product

jetbrains: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-27198In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possibleKEV
    99Now
  • CVE-2023-42793In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possibleKEV
    99Now
  • CVE-2024-27199In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possibleKEV
    89Now
  • CVE-2024-23917In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible
    55Plan
  • CVE-2025-46618In JetBrains TeamCity before 2025.03.1 stored XSS was possible on Data Directory tab
    43Plan
  • CVE-2024-31138In JetBrains TeamCity before 2024.03 xSS was possible via Agent Distribution settings
    43Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
JetBrains TeamCity2026.1.3, 2025.11.7Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×6

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Metasploit moduleexploit/multi/http/jetbrains_teamcity_rce_cve_2026_63077JetBrains TeamCity Agent Polling Unauthenticated Remote Code Executionexploit2026-07-27
Nuclei detection templateNuclei template CVE-2026-63077 —
Proof-of-concept repository on GitHubstars:02026-07-30
Proof-of-concept repository on GitHubstars:192026-08-07
Proof-of-concept repository on GitHubstars:02026-08-08
Proof-of-concept repository on GitHubstars:02026-08-08
Proof-of-concept repository on GitHubstars:02026-08-19
Proof-of-concept repository on GitHubstars:02026-09-04

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-1 d
  2. Published
  3. First PoC+2 d
  4. CISA KEV+8 d
  5. TodaySep 29, 2026+64 d
EPSS, last 120 days+3% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (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

nvd-secondary

Root cause

Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.

The bug in code

The whole CWE-502 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

python
payload = sock.recv(65536)job = pickle.loads(payload)

Fixed

python
payload = sock.recv(65536)if not hmac.compare_digest(sign(payload), header_sig):    raise PermissionError("invalid signature")job = JobSchema.validate(json.loads(payload))

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records