[docs] Port changelog for release 1.2.1

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Note: This PR was automatically generated by the openwisp-utils releaser tool.

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• CHANGES.rst

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• CHANGES.rst

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CHANGES.rst (1)

9-20: LGTM!

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📝 Walkthrough

Walkthrough

A new changelog entry is added to CHANGES.rst for version 1.2.1 [2026-06-15]. The entry is placed under a Bugfixes heading and documents a fix for an admin subnet export multitenancy security issue where staff users could export subnet contents without managing the subnet's organization, as long as a subnet ID was known.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is minimal but appropriate for an auto-generated release PR; however, it lacks most required template sections like checklist, issue reference, and detailed change description.	Expand the description to include the PR checklist, issue reference (if applicable), and more detailed explanation of changes, or clarify why the auto-generated format is exempt from standard template requirements.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required format [type] with 'docs' type and clearly describes the main change: porting the changelog for release 1.2.1.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Bug Fixes	✅ Passed	This is an automated release/documentation PR that ports changelog for v1.2.1, not a bugfix submission. The check applies to PRs that fix bugs; this PR documents a prior bugfix with regression test...

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/port-changelog-1.2.1

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