Cross-Site Scripting (XSS) in mediawiki/semantic-media-wiki (CVE-2026-77607)
Summary
Cross-site scripting in mediawiki/semantic-media-wiki (CVE-2026-77607). Risk of unauthorized operations or information disclosure. Exploitable via sep. Mitigation: upgrade to 7.2.0 or later.
Original description
The description as published by the source.
Failure mode
sep was inserted verbatim into the HTML that joins a table cell's values. This made it possible to inject HTML through the separator value. The same unsanitised table HTML is produced both for the standard Special:Ask render and for its raw request output (request_type=raw), so the injection was reachable without authentication.
Remediation
- In all non-wiki output modes (HTML, raw request, file),
sepis escaped unless it is a safe `` variant. - This preserves legitimate line-break separators while blocking markup injection.
Maintenance note
If the table renderer ever gains richer separator semantics, keep the whitelist explicit. Do not expand the allowed HTML surface casually.
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-2026-77607 has been found in mediawiki/semantic-media-wiki.
Attackers can target a specific entry point like sep over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: upgrade mediawiki/semantic-media-wiki to 7.2.0 or later.
If unsure, ask your IT team or search "mediawiki/semantic-media-wiki CVE-2026-77607" on the vendor's site.
CVE-2026-77607 (mediawiki/semantic-media-wiki) — CWE-79 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: sep
Patched: 7.2.0 — 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.
Cross-site scripting (XSS) (CWE-79) exists in mediawiki/semantic-media-wiki. Attackers reach the vulnerable code path via sep without authentication.
Check the vendor advisory for the affected versions of mediawiki/semantic-media-wiki. Attack surface: sep.
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.
Update to 7.2.0.
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 'mediawiki/semantic-media-wiki' . 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 'mediawiki/semantic-media-wiki' . | 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
mediawiki/semantic-media-wikiを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade mediawiki/semantic-media-wiki to 7.2.0ステージング環境で 7.2.0 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。
-
3Post-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
- web github.com
- web github.com
- web github.com