CVE-2013-4101
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 · uneditedCryptocat before 2.0.22 Link Markup Decorator HTML Handling Weakness
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 · moderate confidenceCryptocat before version 2.0.22 contains an HTML handling weakness in its Link Markup Decorator component. This vulnerability likely allows improper handling of HTML content within links, potentially enabling HTML injection or cross-site scripting (XSS) attacks through specially crafted link markup.
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< 2.0.22CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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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Locate Cryptocat installationIdentify where Cryptocat is installed on your system. This could be a browser extension (check Chrome Extensions or Firefox Add-ons manager), a desktop application (check your programs/applications folder), or a mobile app. Note the platform where it is installed.Affected if Cryptocat is installed on your system in any form
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Determine the installed version numberAccess the version information through the application's interface. For browser extensions: right-click the extension icon and select Options or About. For desktop apps: look in Help menu, About section, or the application settings. For mobile apps: check the app store listing or app information panel.Affected if You can retrieve a version number from the application
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Compare version to 2.0.22Compare your documented version number against the affected range. The vulnerability affects all versions of Cryptocat Project Cryptocat that are less than version 2.0.22. Any version below 2.0.22 falls within the affected range.Affected if The installed version is numerically less than 2.0.22
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Confirm Link Markup Decorator usageThe Link Markup Decorator processes link formatting in chat messages. This feature is typically active by default in Cryptocat chat functionality. Verify that your Cryptocat instance renders or processes clickable links within conversations.Affected if The application processes link markup in chat messages and the version is below 2.0.22
You are affected if you are running any version of Cryptocat below 2.0.22 that processes link markup in chat messages.
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 data2.0.22
Update Cryptocat to version 2.0.22 or later to remediate this HTML handling weakness in the Link Markup Decorator.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2013-4101 — 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-2013-4101 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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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