CVE-2022-22682Network attack vector

Authenticated browser script execution via undisclosed event input

Published Jul 12, 2022 · Updated Sep 17, 2024

Cross-site scripting in Event Management in Synology Calendar before 2.4.5-10930 allows remote authenticated users to inject script or HTML. Synology has not disclosed which Event Management field accepts the input or how its output encoding fails before browser rendering. Exploitation requires an authenticated account and victim interaction, enabling attacker-controlled code in the victim's browser context.

CVSS severity6.5
Medium
EPSS probability0.54%
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 Event Management in Synology Calendar before 2.4.5-10930 allows remote authenticated users to inject script or HTML. Synology has not disclosed which Event Management field accepts the input or how its output encoding fails before browser rendering. Exploitation requires an authenticated account and victim interaction, enabling attacker-controlled code in the victim's browser context.

The record

CVE
CVE-2022-22682
Published
Jul 12, 2022
Updated
Sep 17, 2024
Vendor
Synology
Product
Synology Calendar
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=unspecified <2.4.5-10930

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Synology · Synology Calendarversion=unspecified <2.4.5-10930

Published CVSS scores

6.5Synology Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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