CVE-2021-40970: Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below al

Q: How do I fix CVE-2021-40970?

spotweb: upgrade to newer than 1.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-40970 being exploited?

CVE-2021-40970 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-40970 affect?

CVE-2021-40970 affects spotweb. Severity is medium (CVSS 6.1). Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below allow remote attackers to inject arbitrary web script or HTML via the username parameter.

Q: How urgent is CVE-2021-40970?

Priority 47/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2021-40970 is a medium-severity flaw (CVSS 6.1) affecting spotweb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below allow remote attackers to inject arbitrary web script or HTML via the username parameter.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-10-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: spotweb project

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

Am I affected?

Timeline

2021-10-01 16:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

spotweb project spotweb UPGRADE

Affected: <= 1.5.1

Fixed in: newer than 1.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spotweb

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spotweb

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Spotweb <= 1.5.1 - Cross Site Scripting

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-2021-40970?

spotweb: upgrade to newer than 1.5.1. Exact commands for each OS are on this page.

Is CVE-2021-40970 being exploited?

CVE-2021-40970 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-2021-40970 affect?

CVE-2021-40970 affects spotweb. Severity is medium (CVSS 6.1). Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below allow remote attackers to inject arbitrary web script or HTML via the username parameter.

How urgent is CVE-2021-40970?

Priority 47/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-43725 MEDIUM 6.1 UPGRADE There is a Cross Site Scripting (XSS) vulnerability in SpotPage_login.php of Spotweb 1.5.1 and below, which al
CVE-2021-40973 MEDIUM 6.1 UPGRADE Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below al
CVE-2021-40972 MEDIUM 6.1 UPGRADE Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below al
CVE-2021-40971 MEDIUM 6.1 UPGRADE Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below al
CVE-2021-40969 MEDIUM 6.1 UPGRADE Cross-site scripting (XSS) vulnerability in templates/installer/step-004.inc.php in spotweb 1.5.1 and below al

References

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