CVE-2020-18998Public exploitNetwork attack vector

Stored XSS via unescaped plugin content

Published Aug 27, 2021 · Updated Aug 4, 2024

Stored cross-site scripting in Blog_mini 1.0 allows remote authenticated users to execute script in visitors' browsers through plugin content. The add-plugin handler stores the content field, and app/templates/base.html line 112 renders plugin.content through Jinja2's safe filter without output escaping. Administrator access is required to submit the payload; execution occurs when the home page renders the stored content in a visitor's browser.

CVSS severity6.1
Medium
EPSS probability1.18%
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 Blog_mini 1.0 allows remote authenticated users to execute script in visitors' browsers through plugin content. The add-plugin handler stores the content field, and app/templates/base.html line 112 renders plugin.content through Jinja2's safe filter without output escaping. Administrator access is required to submit the payload; execution occurs when the home page renders the stored content in a visitor's browser.

The record

CVE
CVE-2020-18998
Published
Aug 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 27, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1OSVCVSS: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.

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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')

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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