CVE-2020-35852Public exploitNetwork attack vector

Stored XSS via unrestricted SVG and XML uploads

Published Feb 23, 2021 · Updated Aug 4, 2024

Stored cross-site scripting in GetGist Chatbox 1.0 allows remote attackers to execute scripts by uploading a crafted SVG or XML file. The chat attachment upload accepts SVG and XML content without restricting the file type, then serves an image URL that a browser interprets as active content. Execution requires a user to open the uploaded image URL; the script then runs in that user's browser context and can access session data or perform actions with that user's privileges.

CVSS severity6.1
Medium
EPSS probability1.10%
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 GetGist Chatbox 1.0 allows remote attackers to execute scripts by uploading a crafted SVG or XML file. The chat attachment upload accepts SVG and XML content without restricting the file type, then serves an image URL that a browser interprets as active content. Execution requires a user to open the uploaded image URL; the script then runs in that user's browser context and can access session data or perform actions with that user's privileges.

The record

CVE
CVE-2020-35852
Published
Feb 23, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2021CVE 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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