CVE-2022-4691Public exploitNetwork attack vector

Stored script execution via unrestricted public resource responses

Published Dec 23, 2022 · Updated Apr 10, 2025

Stored XSS in Memos before 0.9.0 allows remote attackers to execute script in another user's browser through a stored resource. The public resource handler returns stored uploads from the Memos origin without a Content-Security-Policy that restricts executable content. Exploitation requires a user to open the affected resource; injected script then runs in that user's Memos origin and can read or alter session-accessible data.

CVSS severity8.3
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Memos before 0.9.0 allows remote attackers to execute script in another user's browser through a stored resource. The public resource handler returns stored uploads from the Memos origin without a Content-Security-Policy that restricts executable content. Exploitation requires a user to open the affected resource; injected script then runs in that user's Memos origin and can read or alter session-accessible data.

The record

CVE
CVE-2022-4691
Published
Dec 23, 2022
Updated
Apr 10, 2025
Vendor
Memos
Product
Memos
Classifications
CWE-79, T1189
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2025Record 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 <0.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Memos · Memosversion=unspecified <0.9.0

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
8.3huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H

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
PrivilegesUnavailable
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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