CVE-2021-45226Public exploitNetwork attack vector

Phishing via Host header password-reset link poisoning

Published Jan 24, 2022 · Updated Aug 4, 2024

Improper input validation in COINS Construction Cloud 11.12 allows remote attackers to poison password-reset links via a crafted Host header. The password-reset function copies the user-controlled HTTP Host header into the target domain of the emailed reset link without validating the destination. No authentication is required, but exploitation depends on a recipient following the poisoned link; the demonstrated consequence is phishing.

CVSS severity6.5
Medium
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in COINS Construction Cloud 11.12 allows remote attackers to poison password-reset links via a crafted Host header. The password-reset function copies the user-controlled HTTP Host header into the target domain of the emailed reset link without validating the destination. No authentication is required, but exploitation depends on a recipient following the poisoned link; the demonstrated consequence is phishing.

The record

CVE
CVE-2021-45226
Published
Jan 24, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-116, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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-116Improper Encoding or Escaping of Output
T1566.002Phishing: Spearphishing 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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