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CVE-2026-39845
SSRF (Server-Side Request Forgery) in weblate (CVE-2026-39845)
Summary
SSRF in weblate (CVE-2026-39845). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `5.17` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-39845** has been found in weblate.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade weblate to **5.17** or later.
If unsure, ask your IT team or search "weblate CVE-2026-39845" on the vendor's site.
CVE-2026-39845 (weblate) — CWE-918 /
Attack vector: remote (network-reachable) / no user interaction
Patched: `5.17` — apply immediately
Workaround: Disabling the add-on would avoid misusing this.
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
**SSRF** (CWE-918) exists in weblate.
📍 Affected scope
weblate — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.17**.
🛡️ Workaround
Workaround: Disabling the add-on would avoid misusing this.
🔍 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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5Apply temporary workaround mitigate
Disabling the add-on would avoid misusing this.パッチが適用されるまでの応急処置として、Disabling the add-on would avoid misusing this. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade weblate to 5.17ステージング環境で 5.17 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":"5.17"}]}]
pip
weblate
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-39845
- package https://github.com/WeblateOrg/weblate
- web https://github.com/WeblateOrg/weblate/security/advisories/GHSA-f8hv-g549-hwg2
- web https://github.com/WeblateOrg/weblate/pull/18815
- web https://github.com/pypa/advisory-database/tree/main/vulns/weblate/PYSEC-2026-156.yaml
- web https://github.com/advisories/GHSA-f8hv-g549-hwg2