CVE-2022-0958Public exploitNetwork attack vector

Stored XSS via unescaped marker attributes

Published Apr 4, 2022 · Updated Aug 2, 2024

Stored XSS in Mark Posts before 2.0.1 allows remote authenticated users with administrator privileges to execute script via a crafted marker. The Add new markers setting stores a marker that is rendered in an HTML attribute without escaping, allowing injected event-handler attributes. An administrator must save the payload, and another user must load a page that renders the marker for the script to run in that visitor's browser context.

CVSS severity4.8
Medium
EPSS probability0.65%
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 Mark Posts before 2.0.1 allows remote authenticated users with administrator privileges to execute script via a crafted marker. The Add new markers setting stores a marker that is rendered in an HTML attribute without escaping, allowing injected event-handler attributes. An administrator must save the payload, and another user must load a page that renders the marker for the script to run in that visitor's browser context.

The record

CVE
CVE-2022-0958
Published
Apr 4, 2022
Updated
Aug 2, 2024
Vendor
Sven Hofmann & Michael Schoenrock
Product
Mark Posts
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=2.0.1 <2.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Sven Hofmann & Michael Schoenrock · Mark Postsversion=2.0.1 <2.0.1

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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