Cross-Site Scripting (XSS) in weblate (CVE-2026-45106)
Summary
Cross-site scripting in weblate (CVE-2026-45106). Risk of unauthorized operations or information disclosure. Exploitable via source. Mitigation: upgrade to 2026.5 or later.
Original description
The description as published by the source.
Weblate is a web based localization tool. Prior to version 2026.5, Weblate's live search preview renders unit source and context as HTML without escaping. Any contributor whose content reaches those fields stores HTML and CSS that runs inside the authenticated editor of every user who runs a matching search. This issue has been patched in version 2026.5.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-45106 has been found in weblate.
Attackers can target a specific entry point like source over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.6/10.
What to do: upgrade weblate to 2026.5 or later.
If unsure, ask your IT team or search "weblate CVE-2026-45106" on the vendor's site.
CVE-2026-45106 (weblate) — CWE-79 / CVSS v3 4.6
Attack vector: remote (network-reachable)
Attack surface: source / context
Patched: 2026.5 — apply immediately
Workaround: Only the search preview on the selected views is affected.
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.
Cross-site scripting (XSS) (CWE-79) exists in weblate. Attackers reach the vulnerable code path via source.
Check the vendor advisory for the affected versions of weblate. Attack surface: source / context.
Severity: Medium (CVSS 4.6/10). Risk of unauthorized operations or information disclosure.
Update to 2026.5.
Workaround: Only the search preview on the selected views is affected.
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
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。 -
2Apply temporary workaround mitigate
Only the search preview on the selected views is affected.パッチが適用されるまでの応急処置として、Only the search preview on the selected views is affected. 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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3Apply patch patch
Upgrade weblate to 2026.5ステージング環境で 2026.5 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を含めること。
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4Post-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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web github.com
- web github.com
- web github.com