CVE-2024-12756
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 · uneditedAn HTML Injection vulnerability in Avaya Spaces may have allowed disclosure of sensitive information or modification of the page content seen by the user.
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 confidenceThis is an HTML Injection vulnerability in Avaya Spaces, a collaboration platform. The vulnerability allows attackers to inject arbitrary HTML into web pages viewed by users, potentially enabling theft of session cookies, credential harvesting via fake login forms, or defacement of page content. HTML injection differs from XSS in that it focuses on injecting HTML tags rather than executing JavaScript.
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 dataall versionsCVSS 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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Confirm Avaya Spaces installationIdentify whether Avaya Spaces is deployed in your environment by checking for the application through your software inventory, IT asset management system, or by accessing the web interface and verifying the product name in the application header or about pageAffected if Avaya Spaces is present in your environment
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Identify user input fieldsLocate all user-controlled input points in Avaya Spaces such as profile fields, messaging inputs, document metadata, search fields, or any form where users can submit text contentAffected if User input fields exist in the application
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Test input validation behaviorSubmit test payloads containing HTML tags (such as <b>, <i>, <img>, or <script>) into user input fields and observe whether these tags are rendered as HTML in the output or are properly escaped/filteredAffected if HTML tags are rendered unescaped in the browser output without sanitization
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Verify cookie handlingCheck if session cookies have the HttpOnly and Secure flags set by inspecting browser developer tools or using a cookie scanning toolAffected if Session cookies lack HttpOnly or Secure flags (indicating elevated risk from HTML injection)
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Check for HTTPS enforcementVerify that Avaya Spaces is only accessible over HTTPS and that HTTP is either disabled or automatically redirects to HTTPSAffected if HTTP access is permitted without automatic redirect to HTTPS
If Avaya Spaces is deployed in your environment and user input fields render HTML tags without sanitization, you are affected by this vulnerability.
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 dataImplement proper input validation and output encoding across all user-controlled fields in Avaya Spaces. Use context-aware sanitization libraries to neutralize HTML tags in user inputs before rendering them in the browser.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $11,200.
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Free · runs locallyCheck whether your project pulls in CVE-2024-12756 — 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-2024-12756 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
- No spam, self-promotion, credentials, or personal data