Debian LinuxOperating system · Debian
CVE-2017-0363
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMediawiki before 1.28.1 / 1.27.2 / 1.23.16 has a flaw where Special:UserLogin?returnto=interwiki:foo will redirect to external sites.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceMediaWiki's Special:UserLogin page accepts an interwiki prefix in the returnto parameter, allowing attackers to craft malicious URLs that redirect authenticated users to external websites after login. This open redirect vulnerability exploits the interwiki linking functionality.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Debian LinuxOperating system
= 7.0>= 1.23.0, <= 1.23.16>= 1.27.0, < 1.27.2>= 1.28.0, < 1.28.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed MediaWiki versionCheck the file includes/Defines.php for the MW_VERSION constant, or access the Special:Version page while logged in as an administratorAffected if The version falls within the ranges >= 1.23.0 through <= 1.23.16, >= 1.27.0 through < 1.27.2, or >= 1.28.0 through < 1.28.1
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Confirm version is in affected rangeCompare the identified version number against the affected ranges: 1.23.0 to 1.23.16, 1.27.0 to 1.27.1, or 1.28.0Affected if The installed version exactly matches one of these vulnerable ranges
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Verify Special:UserLogin page is accessibleAttempt to access the Special:UserLogin page on your installation (index.php?title=Special:UserLogin)Affected if The login page is reachable without authentication
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Test returnto parameter behaviorSubmit a login request with a crafted returnto parameter containing an external interwiki prefix (for example, returnto=https://malicious-site.com) and observe if the redirect occurs after successful authenticationAffected if After login, the user is redirected to the URL specified in the returnto parameter instead of remaining on the local wiki
You are affected if your MediaWiki version is 1.23.0-1.23.16, 1.27.0-1.27.1, or 1.28.0, and the login page processes the returnto parameter to redirect users to arbitrary URLs.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data1.27.21.28.1
Upgrade MediaWiki to version 1.28.1, 1.27.2, 1.23.16, or later to patch the vulnerable redirect logic.
Fix this in Debian Linux
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-0363 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2017-0363 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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