CVE-2021-30111: A stored XSS vulnerability exists in Web-School ERP V 5.0 via (Add Events) in the event name and description f

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-30111 is a medium-severity flaw (CVSS 5.4) affecting enterprise resource planning. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stored XSS vulnerability exists in Web-School ERP V 5.0 via (Add Events) in the event name and description fields. An attack can inject a JavaScript code that will be stored in the page. If any visitor sees the events, then the payload will be executed.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-04-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: web-school

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-08 12:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

web-school enterprise resource planning DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy enterprise-resource-planning || rpm -q enterprise-resource-planning || enterprise-resource-planning --version

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison enterprise-resource-planning sudo apt install enterprise-resource-planning=<VERSION_BEFORE_5.0> sudo apt-mark hold enterprise-resource-planning

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

dnf --showduplicates list enterprise-resource-planning sudo dnf downgrade enterprise-resource-planning-<VERSION_BEFORE_5.0> sudo dnf versionlock add enterprise-resource-planning

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-2021-30111?

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

Is CVE-2021-30111 being exploited?

CVE-2021-30111 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-2021-30111 affect?

CVE-2021-30111 affects enterprise resource planning. Severity is medium (CVSS 5.4). A stored XSS vulnerability exists in Web-School ERP V 5.0 via (Add Events) in the event name and description fields. An attack can inject a JavaScript code that will be stored in the page. If any visitor sees the events, then the payload wi

How urgent is CVE-2021-30111?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2022-34001 MEDIUM 6.5 UPGRADE Unit4 ERP through 7.9 allows XXE via ExecuteServerProcessAsynchronously.
CVE-2021-30114 MEDIUM 6.5 DOWNGRADE Web-School ERP V 5.0 contains a cross-site request forgery (CSRF) vulnerability that allows a remote attacker
CVE-2021-30113 MEDIUM 6.1 DOWNGRADE A blind XSS vulnerability exists in Web-School ERP V 5.0 via (Add Events) in event name and description fields
CVE-2021-30112 MEDIUM 6.5 DOWNGRADE Web-School ERP V 5.0 contains a cross-site request forgery (CSRF) vulnerability that allows a remote attacker
CVE-2015-1312 HIGH 7.5 MITIGATE The Dealer Portal in SAP ERP does not properly restrict access, which allows remote attackers to obtain sensit

References

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