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CVE-2026-21889
Vulnerability in weblate (CVE-2026-21889)
Summary
vulnerability in weblate (CVE-2026-21889). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `5.15.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-21889** has been found in weblate.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade weblate to **5.15.2** or later.
If unsure, ask your IT team or search "weblate CVE-2026-21889" on the vendor's site.
CVE-2026-21889 (weblate) — CWE-284 /
Patched: `5.15.2` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-284) exists in weblate.
📍 Affected scope
weblate — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.15.2**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'weblate' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'weblate' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `weblate` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade weblate to 5.15.2ステージング環境で 5.15.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
PyPI
weblate
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.2"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-21889
- advisory https://github.com/advisories/GHSA-3g2f-4rjg-9385
- package https://github.com/WeblateOrg/weblate
- package https://pypi.org/project/weblate
- web https://github.com/WeblateOrg/weblate/security/advisories/GHSA-3g2f-4rjg-9385
- web https://github.com/WeblateOrg/weblate/pull/17516
- web https://github.com/WeblateOrg/weblate/commit/a6eb5fd0299780eca286be8ff187dc2d10feec47