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Vulnerabilities

Vulnerability · CVE-2021-26746

chamilo chamilo Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Published Feb 19, 2021 · catalog updated Oct 20, 2026 · chamilo chamilo Improper Neutralization

Patch now

CVE-2021-26746 is in the CISA known-exploited catalog. Confirm chamilo chamilo Improper Neutralization against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (chamilo chamilo Improper Neutralization).
Severity
Medium6.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.99%
Remediation
Remediation guidance
Affected products
cpe chamilo/chamilo · vendor chamilo chamilo

Chamilo 1.11.14 allows XSS via a main/calendar/agenda_list.php?type= URI.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe chamilo/chamilo1.11.14
  • vendor chamilo chamiloversion unspecified

How to fix CVE-2021-26746

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-26746 is in the CISA known-exploited catalog. Confirm chamilo chamilo Improper Neutralization against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 1.11.14. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.99%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2026 · VulnCheck KEV

    Detected

    Chamilo 1.11.14 allows XSS via a main/calendar/agenda_list.php?type= URI.

  2. Oct 20, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2021-26746

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-26746

    30-day exploitation probability 0.99%

    first.org
  • NIST NVDVulnerability recordCVE-2021-26746

    Chamilo 1.11.14 allows XSS via a main/calendar/agenda_list.php?type= URI.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-26746

    Chamilo 1.11.14 allows XSS via a main/calendar/agenda_list.php?type= URI.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 21, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.