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Weekly Signal
Live intelligence Updated 22 Aug 2026 · 21:25 UTC

Atlassian · Sourcetree

CVE-2026-21575

This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.11 of Sourcetree for Mac and Sourcetree for Windows. Thi...

Recommended action

Handle this through the normal risk-based patching cycle while monitoring for change. Atlassian Security advisory Viewpage.action

View response plan
CVSS8.0
EPSS0.3%
KEVNo
ExploitationNone
RemediationNot yet verified ↓

Assessment

Why it matters

EPSS is 0.3%; technical severity is CVSS 8.0.

This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.11 of Sourcetree for Mac and Sourcetree for Windows. This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to execute arbitrary code which has high impact to confidentiality, high impact to integrity, high impact to availability, and requires user interaction. Atlassian recommends that Sourcetree for Mac and Sourcetree for Windows customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: * Sourcetree for Mac and Sourcetree for Windows 3.4: Upgrade to a release greater than or equal to 3.4.13 See the release notes (https://www.sourcetreeapp.com/download-archives). You can download the latest version of Sourcetree for Mac and Sourcetree for Windows from the download center (https://www.sourcetreeapp.com/download-archives). This vulnerability was reported via our Bug Bounty program.

Who should care

  • Teams operating Sourcetree
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Sourcetree is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Atlassian Security advisory Viewpage.action
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Advisory

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE
CWE-94
Affected versions
Atlassian Sourcetree (Start Including 3.4.11, End Excluding 3.4.13 | Start Including 3.4.11, End Excluding 3.4.13)
Fixed versions
Atlassian Sourcetree (Fixed from 3.4.13)
Published
21 July 2026
Attack vector
Network
Privileges required
Low
User interaction
Required

Signal timeline

  1. CVE published
  2. Latest EPSS score: 0.3%
  3. Signal calculated at 12
Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.