CVE-2021-32806Network attack vector

Open redirect via scheme-only URL misclassification

Published Aug 2, 2021 · Updated Aug 3, 2024

Open redirect in Plone Products.isurlinportal before 1.2.0 allows remote attackers to send victims to an external site via a crafted URL. The isURLInPortal method treats scheme-only input such as https:example.org as internal because parsing yields a scheme without a host. Exploitation requires a victim to follow the crafted link and a browser that resolves the scheme-only form externally, enabling phishing redirects without content modification.

CVSS severity7.1
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Plone Products.isurlinportal before 1.2.0 allows remote attackers to send victims to an external site via a crafted URL. The isURLInPortal method treats scheme-only input such as https:example.org as internal because parsing yields a scheme without a host. Exploitation requires a victim to follow the crafted link and a browser that resolves the scheme-only form externally, enabling phishing redirects without content modification.

The record

CVE
CVE-2021-32806
Published
Aug 2, 2021
Updated
Aug 3, 2024
Vendor
Plone
Product
Products.isurlinportal
Classifications
CWE-601, CAPEC-178, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Plone · Products.isurlinportalversion=< 1.2.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
7.1GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1566.002Spearphishing Link

Public exploit references

No public exploit references are available in this record.

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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