Cross-Site Scripting (XSS) in Shaarli (CVE-2026-50190)
Summary
Cross-site scripting in Shaarli (CVE-2026-50190). Risk of unauthorized operations or information disclosure. Exploitable via permalink.
Original description
The description as published by the source.
Shaarli is a personal bookmarking service. Versions prior to 0.16.3 are vulnerable to stored XSS in application/front/controller/visitor/BookmarkListController.php. The permalink handler concatenates the raw $bookmark->getTitle() into the pagetitle template variable and the RainTPL template emits it into the document element without HTML escaping. A bookmark title containing `...` closes the document title early and the injected script executes in the Shaarli origin for any visitor of `/shaare/{hash}`. Shaarli's metadata fetcher copies a remote page's text verbatim into the local bookmark title, so an attacker who hosts an attacker-controlled URL and convinces an administrator to bookmark it plants the payload with no further interaction — and the resulting permalink fires for every visitor including the administrator on first save, providing a one-shot administrator account takeover. Version 0.16.3 fixes the issue.
Source: NIST National Vulnerability Database 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-2026-50190 has been found in Shaarli.
Attackers can target a specific entry point like permalink over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Shaarli CVE-2026-50190" on the vendor's site.
CVE-2026-50190 (Shaarli) — CWE-79
Attack surface: permalink / pagetitle
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 Shaarli. Attackers reach the vulnerable code path via permalink.
Check the vendor advisory for the affected versions of Shaarli. Attack surface: permalink / pagetitle.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Shaarli' . 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
-
1Identify exposure identify
grep -r 'Shaarli' . | 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
Shaarliを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-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。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-50190 shaarli
- Ubuntu UBUNTU-CVE-2026-50190 shaarli
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov