CVE-2020-23719Public exploitNetwork attack vector

Stored script execution via decoded bbsmeta output

Published Nov 2, 2021 · Updated Aug 4, 2024

Stored XSS in xujinliang Zibbs 1.0 allows remote authenticated users to execute script in visitors' browsers through bbsmeta. AdminController stores the setting after escaping it, but the foreground index view passes the stored value through htmlspecialchars_decode before inserting it into HTML. Administrative access to background settings is required to plant the payload, which runs in each visitor's browser when the foreground page is opened.

CVSS severity9.6
Critical
EPSS probability1.36%
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 xujinliang Zibbs 1.0 allows remote authenticated users to execute script in visitors' browsers through bbsmeta. AdminController stores the setting after escaping it, but the foreground index view passes the stored value through htmlspecialchars_decode before inserting it into HTML. Administrative access to background settings is required to plant the payload, which runs in each visitor's browser when the foreground page is opened.

The record

CVE
CVE-2020-23719
Published
Nov 2, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 2, 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

9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
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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