CVE-2021-44565Public exploitNetwork attack vector

Stored XSS via outdated input filter

Published Feb 22, 2022 · Updated Aug 4, 2024

Stored XSS in RosarioSIS before 7.6.1 allows remote authenticated users to inject JavaScript or HTML through Markdown input fields. The classes/Security.php xss_clean function uses an outdated CodeIgniter denylist that fails to repeatedly decode and neutralize crafted encodings, tags, and event attributes before Markdown content is stored and rendered. A user must be able to submit Markdown content and another user must view the rendered field, allowing script execution in that viewer's browser under the RosarioSIS origin.

CVSS severity5.4
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in RosarioSIS before 7.6.1 allows remote authenticated users to inject JavaScript or HTML through Markdown input fields. The classes/Security.php xss_clean function uses an outdated CodeIgniter denylist that fails to repeatedly decode and neutralize crafted encodings, tags, and event attributes before Markdown content is stored and rendered. A user must be able to submit Markdown content and another user must view the rendered field, allowing script execution in that viewer's browser under the RosarioSIS origin.

The record

CVE
CVE-2021-44565
Published
Feb 22, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2022CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo