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Vulnerabilities

Security incident · CVE-2026-96631

AdminNeo has Cookie Attribute Injection via Unsanitized X-Forwarded-Prefix in Set-Cookie Headers

Published Oct 30, 2026 · catalog updated Oct 30, 2026 · AdminNeo has Cookie Attribute

Last checked Nov 8, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for CVE-2026-96631. A missing EPSS score is not a low risk. Compare AdminNeo has Cookie Attribute with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (AdminNeo has Cookie Attribute).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Not in the current FIRST EPSS dataset
Remediation
Advisory link
Affected products
Packagist adminneo-org/adminneo · composer adminneo-org

### Summary AdminNeo versions 4.6.0 through at least 5.5.0 are vulnerable to cookie attribute injection via the HTTP header. An attacker who can influence this header (e.g., through a reverse proxy that forwards it from clients, an attacker-controlled upstream proxy, or a man-in-the-middle position) can inject arbitrary cookie attributes including , , , and into all response headers emitted by AdminNeo. This allows an attacker to expand the cookie scope to an attacker-controlled domain (e.g., ), causing the victim's browser to send AdminNeo's (session ID) and (database password encryption key) cookies to the attacker's server on subsequent requests. Originally reported by @retkoussa in Adminer: https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h ### Vulnerable Code **Root cause 1 - Unsanitized header prepended to ** ( , lines 50–52): The client-supplied header is concatenated into with no validation or sanitization of special characters (specifically semicolons, which delimit cookie attributes). **Root cause 2 - Manual header construction without escaping** ( , lines 416–424): The tainted is interpolated directly into the attribute of the header. Since semicolons are not stripped or escaped, any -separated directives injected via become valid cookie attributes parsed by the browser. **Root cause 3 - Session cookie also tainted** ( , line 61): The PHP session cookie ( ) path is similarly derived from the tainted , extending the same vulnerability to the session cookie set by PHP itself. ### Impact - **Session hijacking:** The session cookie is sent to the attacker's domain, allowing full session takeover. - **Credential theft:** The cookie contains the key used to encrypt/decrypt database passwords stored in the session. With this key, an attacker can decrypt saved database credentials. - **Session fixation:** An attacker can inject arbitrary , , and attributes, manipulating cookie behavior. - **Wide applicability:** The header was specifically a

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Packagist adminneo-org/adminneo4.6.0 → 5.5.1
  • composer adminneo-orgversion unspecified

How to fix CVE-2026-96631

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for CVE-2026-96631. A missing EPSS score is not a low risk. Compare AdminNeo has Cookie Attribute with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 4.6.0 → 5.5.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-113; CWE-20: Improper Input Validation. EPSS is absent from the current FIRST dataset. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 30, 2026 · GitHub Advisory Database

    Detected

    ### Summary AdminNeo versions 4.6.0 through at least 5.5.0 are vulnerable to cookie attribute injection via the HTTP header. An attacker who can influence this header (e.g., through a reverse proxy that forwards it from clients, an attacker-controlled upstream proxy, or a man-in-the-middle position) can inject arbitrary cookie attributes including , , , and into all response headers emitted by Adm

  2. Oct 30, 2026 · GitHub Advisory Database

    Fix available

    adminneo-org/adminneo fixed in 5.5.1

  3. Oct 30, 2026 · GitHub Advisory Database

    Fix available

    adminneo-org/adminneo fixed in 5.5.1

  4. Oct 30, 2026 · GitHub Advisory Database

    Updated

    ### Summary AdminNeo versions 4.6.0 through at least 5.5.0 are vulnerable to cookie attribute injection via the HTTP header. An attacker who can influence this header (e.g., through a reverse proxy that forwards it from clients, an attacker-controlled upstream proxy, or a man-in-the-middle position) can inject arbitrary cookie attributes including , , , and into all response headers emitted by Adm

Sources

  • CVE.orgVulnerability recordCVE-2026-96631

    Official CVE identifier

    cve.org
  • GitHub Advisory DatabasePackage advisoryGHSA-79wv-8rh2-9vp2

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-96631

    AdminNeo versions 4.6.0 through at least 5.5.0 are vulnerable to cookie attribute injection via the X-Forwarded-Prefix HTTP header. An attacker who can influence this header (e.g., through a reverse proxy that forwards it from clients, an attacker-controlled upstream proxy, or a man-in-the-middle position) can inject arbitrary cookie attributes including Domain, Path, Secure, and SameSite into all

    advisories.gitlab.com
  • OpenSSF OSV / OSV ScannerPackage advisoryGHSA-79wv-8rh2-9vp2

    AdminNeo has Cookie Attribute Injection via Unsanitized X-Forwarded-Prefix in Set-Cookie Headers

    osv.dev

References

Freshness

Last verified in this catalog Nov 8, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitLab Advisory DatabaseNov 5, 2026
  • GitHub Advisory DatabaseNov 2, 2026
  • OpenSSF OSV / OSV ScannerNov 2, 2026
  • CVE.orgOct 31, 2026