Vulnerability in mediawiki
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 DEBIAN-CVE-2020-35475 has been found in mediawiki.
Confidential information can be exposed externally.
What to do: upgrade mediawiki to 1:1.35.1-1 or later.
If unsure, ask your IT team or search "mediawiki DEBIAN-CVE-2020-35475" on the vendor's site.
DEBIAN-CVE-2020-35475 (mediawiki)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1:1.35.1-1 — 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.
A vulnerability (unclassified) exists in mediawiki.
Check the vendor advisory for the affected versions of mediawiki.
Severity: ?. Confidential information can be exposed externally.
Update to 1:1.35.1-1.
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' . 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
-
1
Identify exposureidentify
grep -r 'mediawiki' . | 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を grep し、稼働しているサービス・バージョンを把握する。 -
2
Apply patchpatch
Upgrade mediawiki to 1:1.35.1-1ステージング環境で 1:1.35.1-1 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。
-
3
Post-deployment verificationverify
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
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| Debian:12 | mediawiki |
< 1:1.35.1-1 |
1:1.35.1-1 |
| Debian:13 | mediawiki |
< 1:1.35.1-1 |
1:1.35.1-1 |
| Debian:14 | mediawiki |
< 1:1.35.1-1 |
1:1.35.1-1 |
Original description The description as published by the source.
In MediaWiki before 1.35.1, the messages userrights-expiry-current and userrights-expiry-none can contain raw HTML. XSS can happen when a user visits Special:UserRights but does not have rights to change all userrights, and the table on the left side has unchangeable groups in it. (The right column with the changeable groups is not affected and is escaped correctly.)
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security-tracker.debian.org