CVE-2023-47260
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 · uneditedRedmine before 4.2.11 and 5.0.x before 5.0.6 allows XSS via thumbnails.
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 confidenceRedmine versions before 4.2.11 and 5.0.6 contain a stored Cross-Site Scripting (XSS) vulnerability in the thumbnail generation functionality. Attackers can embed malicious JavaScript in file attachments that are displayed as thumbnails, which then executes in the browsers of users who view those thumbnails.
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< 4.2.11>= 5.0.0, < 5.0.6CVSS 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:3.1/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 Redmine versionCheck your Redmine installation's version. This is typically displayed on the login page, in the administration panel under 'Information', or by running: ruby -e "require File.join(Rails.root, 'config/environment'); puts Redmine::VERSION.to_s" from the Redmine root directory.Affected if The installed version is less than 4.2.11, or is 5.0.0 through 5.0.5 (i.e., falls within < 4.2.11 or >= 5.0.0, < 5.0.6)
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Confirm file attachment uploads are enabledIn Redmine, go to Administration > Settings > File uploads. Verify that 'Allow attachments' is enabled and that users can upload files to issues, documents, or wikis.Affected if Attachments are enabled and users can upload files to the system
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Check if thumbnail generation is activeVerify that the 'Thumbnail' option is enabled for uploaded files. In Administration > Settings > File uploads, look for thumbnail-related settings. Thumbnails are automatically generated for image attachments (e.g., PNG, JPG, GIF) when displayed in issues, documents, or the file library.Affected if Thumbnail generation is enabled and image attachments can be viewed by users
A Redmine instance is affected if it runs a version below 4.2.11 or between 5.0.0 and 5.0.5, and has both file attachment uploads and thumbnail viewing enabled for users.
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.
dbcve · scoped4.2.115.0.6
Upgrade Redmine to version 4.2.11, 5.0.6, or later to patch the XSS vulnerability in thumbnail handling.
Redmine 4.2.11 or 5.0.6 (depending on your current branch)
- Identify current Redmine version by checking the version file or application UI
- Back up the Redmine database and all configuration files
- For Redmine 4.x users: Upgrade to Redmine 4.2.11 or later
- For Redmine 5.0.x users: Upgrade to Redmine 5.0.6 or later
- After upgrade, clear any cached assets (delete tmp/cache and tmp/sessions directories)
- Restart the Redmine application server (Puma, Passenger, or Unicorn)
- Verify the upgrade was successful by checking the Redmine version in the administration panel
- Test that the thumbnail functionality works properly after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 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 $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-47260 — 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-2023-47260 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
- No weaponised exploit code, or anything meant to cause harm
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