CVE-2021-47808Public exploitNetwork attack vector

Stored script execution via unneutralized site title

Published Jan 15, 2026 · Updated Jan 15, 2026

Stored cross-site scripting in Cotonti Siena 0.9.19 allows remote authenticated users to execute scripts through the maintitle parameter. The admin configuration update stores the maintitle value and later renders it on the home page without neutralizing event-handler markup. Administrative access is required to plant the payload, and script execution occurs when the stored site title is rendered in a visitor's browser.

CVSS severity5.1
Medium
EPSS probability0.27%
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 Cotonti Siena 0.9.19 allows remote authenticated users to execute scripts through the maintitle parameter. The admin configuration update stores the maintitle value and later renders it on the home page without neutralizing event-handler markup. Administrative access is required to plant the payload, and script execution occurs when the stored site title is rendered in a visitor's browser.

The record

CVE
CVE-2021-47808
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Cotonti
Product
Cotonti Siena
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.9.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Cotonti · Cotonti Sienaversion=0.9.19

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
5.4VulnCheckCVSS: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.

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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')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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