CVE-2022-4877Network attack vector

Cross-site scripting via unescaped Host header

Published Jan 5, 2023 · Updated Aug 3, 2024

Cross-site scripting in Michael Snoyman's Keter 1.8.0 and 1.8.1 allows remote authenticated users to execute script via a spoofed Host header. The defaultUnknownHostBody function inserts the unrecognized Host value directly into the missing-host HTML response without escaping it. Exploitation requires access sufficient to submit the spoofed header and user interaction with that response; successful exploitation runs attacker-supplied markup in the victim's browser.

CVSS severity6.1
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Michael Snoyman's Keter 1.8.0 and 1.8.1 allows remote authenticated users to execute script via a spoofed Host header. The defaultUnknownHostBody function inserts the unrecognized Host value directly into the missing-host HTML response without escaping it. Exploitation requires access sufficient to submit the spoofed header and user interaction with that response; successful exploitation runs attacker-supplied markup in the victim's browser.

The record

CVE
CVE-2022-4877
Published
Jan 5, 2023
Updated
Aug 3, 2024
Vendor
Michael Snoyman
Product
Keter
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 5, 2023CVE 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=1.8.0
  2. Affected versionversion=1.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Michael Snoyman · Keterversion=1.8.0; version=1.8.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious 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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