CVE-2025-27453
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 · uneditedThe HttpOnly flag is set to false on the PHPSESSION cookie. Therefore, the cookie can be accessed by other sources such as JavaScript.
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 confidenceThe PHPSESSION cookie is configured with the HttpOnly flag set to false, allowing JavaScript code in the browser to access the session cookie. This vulnerability exposes session credentials to cross-site scripting (XSS) attacks, enabling attackers to potentially hijack user sessions.
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<= 0.16.0CVSS 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
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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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Check firmware versionAccess the device management interface or check system information to determine the installed Endress Meac300 Fnade4 Firmware versionAffected if The firmware version is 0.16.0 or lower
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Verify PHPSESSION cookie is in useLog into the web application and inspect the cookies set by the server using browser developer tools or capture an HTTP response headersAffected if A PHPSESSION cookie is being set by the server
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Inspect HttpOnly flag on PHPSESSION cookieExamine the Set-Cookie header or cookie details in the browser DevTools Security/Application tab for the HttpOnly attributeAffected if The PHPSESSION cookie exists and the HttpOnly attribute is missing or set to false
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Check PHP session configurationIf access to server configuration is available, examine the session.cookie_httponly setting in php.ini or the server configuration filesAffected if session.cookie_httponly is disabled or set to 0
A user is affected if the Endress Meac300 Fnade4 Firmware version is 0.16.0 or lower AND the PHPSESSION cookie is missing the HttpOnly flag, allowing JavaScript access to session credentials.
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 dataConfigure the PHPSESSION cookie to include the HttpOnly flag set to true in the PHP configuration (session.cookie_httponly) or server configuration to prevent JavaScript access.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27453 — 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-2025-27453 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
- No spam, self-promotion, credentials, or personal data