CVE-2021-41952Network attack vector

Session-cookie theft via uploaded SVG script

Published Mar 14, 2022 · Updated Aug 4, 2024

Stored cross-site scripting in Zenario CMS 9.0.54156 allows remote authenticated users to steal session cookies through an uploaded SVG. The contact-image viewer serves an uploaded SVG containing attacker-controlled script, which the victim's browser executes in the site's origin. Uploading requires high privileges, and exploitation requires another user to view the contact image; successful cookie theft enables account takeover.

CVSS severity4.8
Medium
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 Zenario CMS 9.0.54156 allows remote authenticated users to steal session cookies through an uploaded SVG. The contact-image viewer serves an uploaded SVG containing attacker-controlled script, which the victim's browser executes in the site's origin. Uploading requires high privileges, and exploitation requires another user to view the contact image; successful cookie theft enables account takeover.

The record

CVE
CVE-2021-41952
Published
Mar 14, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1539
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

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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