CVE-2025-63828Public exploitNetwork attack vector

Session hijacking via untrusted password-reset Host header

Published Nov 18, 2025 · Updated Nov 19, 2025

Host header injection in Backdrop CMS 1.32.1 allows remote attackers to redirect password-reset users to an attacker-controlled domain. The password-reset response builds its Location header and cookie domain from the untrusted Host header without checking the configured site origin. A targeted user must follow the poisoned reset flow, which redirects the browser and sets an attacker-domain cookie used for session hijacking.

CVSS severity6.1
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Host header injection in Backdrop CMS 1.32.1 allows remote attackers to redirect password-reset users to an attacker-controlled domain. The password-reset response builds its Location header and cookie domain from the untrusted Host header without checking the configured site origin. A targeted user must follow the poisoned reset flow, which redirects the browser and sets an attacker-domain cookie used for session hijacking.

The record

CVE
CVE-2025-63828
Published
Nov 18, 2025
Updated
Nov 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-644, CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.9GitHub Advisory DatabaseCVSS: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
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-644Improper Neutralization of HTTP Headers for Scripting Syntax
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001User Execution Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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