CVE-2021-45416: Reflected Cross-site scripting (XSS) vulnerability in RosarioSIS 8.2.1 allows attackers to inject arbitrary HT

This month

MEDIUM 6.1DOWNGRADE

CVE-2021-45416 is a medium-severity flaw (CVSS 6.1) affecting rosariosis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Reflected Cross-site scripting (XSS) vulnerability in RosarioSIS 8.2.1 allows attackers to inject arbitrary HTML via the search_term parameter in the modules/Scheduling/Courses.php script.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-02-01
Last modified	2026-07-09

Publisher (CNA): MITRE · Vendor: rosariosis

Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-02-01 13:15 UTCPublished CVE record published
2026-07-09 01:17 UTCUpdated Record last modified

rosariosis rosariosis DOWNGRADE

Affected: 8.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.2.1

1. Check installed version

apt-cache policy rosariosis || rpm -q rosariosis || rosariosis --version

2. No fixed release: DOWNGRADE to a release before 8.2.1 (Debian / Ubuntu)

apt-cache madison rosariosis sudo apt install rosariosis=<VERSION_BEFORE_8.2.1> sudo apt-mark hold rosariosis

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list rosariosis sudo dnf downgrade rosariosis-<VERSION_BEFORE_8.2.1> sudo dnf versionlock add rosariosis

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-45416?

rosariosis: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-45416 being exploited?

CVE-2021-45416 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-45416 affect?

CVE-2021-45416 affects rosariosis. Severity is medium (CVSS 6.1). Reflected Cross-site scripting (XSS) vulnerability in RosarioSIS 8.2.1 allows attackers to inject arbitrary HTML via the search_term parameter in the modules/Scheduling/Courses.php script.

How urgent is CVE-2021-45416?

Priority 47/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2023-2665 HIGH 7.5 UPGRADE Storage of Sensitive Data in a Mechanism without Access Control in GitHub repository francoisjacquet/rosariosi
CVE-2023-2202 MEDIUM 6.5 UPGRADE Improper Access Control in GitHub repository francoisjacquet/rosariosis prior to 10.9.3.
CVE-2023-29918 MEDIUM 5.4 DOWNGRADE RosarioSIS 10.8.4 is vulnerable to CSV injection via the Periods Module.
CVE-2023-0994 HIGH 7.5 UPGRADE Exposure of Sensitive Information to an Unauthorized Actor in GitHub repository francoisjacquet/rosariosis pri
CVE-2022-3072 MEDIUM 5.4 UPGRADE Cross-site Scripting (XSS) - Stored in GitHub repository francoisjacquet/rosariosis prior to 8.9.3.

References

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