CVE-2021-47981Public exploitNetwork attack vector

Stored XSS via unsanitized slider description

Published May 16, 2026 · Updated May 16, 2026

Stored XSS in the sliders form in OpenSolution Quick.Cms 6.7 allows remote authenticated users to execute JavaScript in victim browsers. The admin.php?p=sliders-form handler accepts sDescription content containing a closing textarea tag and script element, then persists the executable markup. Exploitation requires either slider-administration access or a victim with an authenticated administrator session to submit a crafted cross-site form, after which the script runs in that browser session.

CVSS severity5.1
Medium
EPSS probability0.18%
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 the sliders form in OpenSolution Quick.Cms 6.7 allows remote authenticated users to execute JavaScript in victim browsers. The admin.php?p=sliders-form handler accepts sDescription content containing a closing textarea tag and script element, then persists the executable markup. Exploitation requires either slider-administration access or a victim with an authenticated administrator session to submit a crafted cross-site form, after which the script runs in that browser session.

The record

CVE
CVE-2021-47981
Published
May 16, 2026
Updated
May 16, 2026
Vendor
OpenSolution
Product
Quick.Cms
Classifications
CWE-79, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. May 16, 2026CVE publishedPublication date reported by the CVE source.
  2. May 16, 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=6.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

OpenSolution · Quick.Cmsversion=6.7

Published CVSS scores

5.4VulnCheckCVSS: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:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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