CVE-2020-12882Public exploitNetwork attack vector

Stored XSS via unsanitized SVG upload

Published May 15, 2020 · Updated Aug 4, 2024

Cross-site scripting in Submitty through 20.04.01 allows remote authenticated users to execute script in a Teaching Fellow's browser via an uploaded SVG. Submitty stores or serves the uploaded SVG without neutralizing executable script content, so a Student can plant a payload that runs when the Teaching Fellow views it. The attack requires an authenticated Student upload and victim interaction; impact is browser-side confidentiality and integrity loss rather than server execution.

CVSS severity5.4
Medium
EPSS probability1.20%
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 Submitty through 20.04.01 allows remote authenticated users to execute script in a Teaching Fellow's browser via an uploaded SVG. Submitty stores or serves the uploaded SVG without neutralizing executable script content, so a Student can plant a payload that runs when the Teaching Fellow views it. The attack requires an authenticated Student upload and victim interaction; impact is browser-side confidentiality and integrity loss rather than server execution.

The record

CVE
CVE-2020-12882
Published
May 15, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 15, 2020CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
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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