CVE-2022-4637Public exploitNetwork attack vector

Stored XSS via unescaped booking aliases

Published Dec 21, 2022 · Updated Apr 14, 2025

Stored cross-site scripting in Tobias Krebs ep-3 Bookingsystem 1.0 through 1.7 allows remote authenticated users to run script via a booking alias. Multiple calendar and booking views insert the stored user alias into HTML without output encoding, causing a crafted booked-to value to become executable markup. The reported path requires administrator access and a user opening the affected booking day; ordinary-user reachability remains unverified.

CVSS severity3.5
Low
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Tobias Krebs ep-3 Bookingsystem 1.0 through 1.7 allows remote authenticated users to run script via a booking alias. Multiple calendar and booking views insert the stored user alias into HTML without output encoding, causing a crafted booked-to value to become executable markup. The reported path requires administrator access and a user opening the affected booking day; ordinary-user reachability remains unverified.

The record

CVE
CVE-2022-4637
Published
Dec 21, 2022
Updated
Apr 14, 2025
Vendor
Tobias Krebs
Product
ep-3 Bookingsystem
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.0
  2. Affected versionversion=1.1
  3. Affected versionversion=1.2
  4. Affected versionversion=1.3
  5. Affected versionversion=1.4
  6. Affected versionversion=1.5
  7. Affected versionversion=1.6
  8. Affected versionversion=1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tobias Krebs · ep-3 Bookingsystemversion=1.0; version=1.1; version=1.2; version=1.3; version=1.4; version=1.5; version=1.6; version=1.7

Published CVSS scores

6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.5VulDBCVSS:3.0/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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