CVE-2020-1323Network attack vector

Spoofing via crafted open redirect URL

Published Jun 9, 2020 · Updated Aug 4, 2024

Open redirect in Microsoft SharePoint Server 2019, Foundation 2013 SP1, and Enterprise Server 2016 allows remote attackers to spoof links. Microsoft has not published the affected handler or the validation error that permits an untrusted redirect target. Exploitation requires a user to click a crafted link, after which the browser can be redirected to attacker-chosen content for spoofing.

CVSS severity6.1
Medium
EPSS probability2.14%
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 Microsoft SharePoint Server 2019, Foundation 2013 SP1, and Enterprise Server 2016 allows remote attackers to spoof links. Microsoft has not published the affected handler or the validation error that permits an untrusted redirect target. Exploitation requires a user to click a crafted link, after which the browser can be redirected to attacker-chosen content for spoofing.

The record

CVE
CVE-2020-1323
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Microsoft SharePoint Server
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2020CVE 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?

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

  1. Affected versionversion=2019

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft SharePoint Serverversion=2019
Microsoft · Microsoft SharePoint Foundationversion=2013 Service Pack 1
Microsoft · Microsoft SharePoint Enterprise Serverversion=2016

Published CVSS scores

5.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:P/A:N
6.1NIST National Vulnerability DatabaseCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
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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