CVE-2025-63828: Backdrop/backdrop Backdrop CMS Host Header Injection Vulnerability

MODERATE
Advisory Identifier: GHSA-ffpg-gm3h-4p5p
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CWE-601 CWE-644
Published
Advisory Summary

CVE-2025-63828 is a MODERATE backdrop cms host header injection vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Backdrop/backdrop libraries in the Packagist ecosystem. The issue involves backdrop cms host header injection vulnerability. Remediation is available in the latest vendor maintenance releases.

CVE-2025-63828 at a Glance

CVE Identifier CVE-2025-63828
GHSA Identifier GHSA-ffpg-gm3h-4p5p
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Backdrop/backdrop
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2025-63828

To remediate this vulnerability, upgrade all affected Backdrop/backdrop dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

backdrop/backdrop fixed: Latest secure release 
Upgrade backdrop/backdrop to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for backdrop/backdrop

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-63828, inspect your project dependencies for Backdrop/backdrop:

inspect dependencies for backdrop/backdrop

Analyze the terminal output to locate any version of Backdrop/backdrop in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Backdrop/backdrop, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Host Header Injection vulnerability in Backdrop CMS 1.32.1 allows attackers to manipulate the Host header in password reset requests, leading to redirects to malicious domains and potential session hijacking via cookie injection.

CVE-2025-63828 Affected Backdrop/backdrop Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
backdrop/backdrop
 Packagist
≤ 1.32.0

References

NVD — CVE-2025-63828 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-63828
Backdrop/backdrop Source Repository REPOSITORY
https://github.com/backdrop/backdrop
Backdrop/backdrop Source Repository REPOSITORY
https://github.com/mertdurum06/BackdropCms-1.32.1
Backdrop/backdrop Source Repository REPOSITORY
https://github.com/mertdurum06/BackdropCms-1.32.1/blob/main/backdropcms_exploit.txt

Frequently Asked Questions

What is CVE-2025-63828?
CVE-2025-63828 is a security vulnerability in Backdrop/backdrop involving Backdrop CMS Host Header Injection vulnerability under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Backdrop/backdrop versions are affected?
Affected versions include releases prior to current release patches across affected packages: backdrop/backdrop.
What version fixes CVE-2025-63828?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is backdrop/backdrop affected?
Yes, backdrop/backdrop is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2025-63828?
CVE-2025-63828 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Packagist dependencies for CVE-2025-63828?
Run the dependency tree command: 'inspect dependencies for backdrop/backdrop'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ffpg-gm3h-4p5p",
  "modified" : "2025-11-19T18:59:46Z",
  "published" : "2025-11-18T18:32:55Z",
  "aliases" : [ "CVE-2025-63828" ],
  "summary" : "Backdrop CMS Host Header Injection vulnerability",
  "details" : "Host Header Injection vulnerability in Backdrop CMS 1.32.1 allows attackers to manipulate the Host header in password reset requests, leading to redirects to malicious domains and potential session hijacking via cookie injection.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "backdrop/backdrop"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.32.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-63828"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/backdrop/backdrop"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mertdurum06/BackdropCms-1.32.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mertdurum06/BackdropCms-1.32.1/blob/main/backdropcms_exploit.txt"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601", "CWE-644" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-11-18T21:56:57Z",
    "nvd_published_at" : "2025-11-18T18:16:13Z"
  }
}