CVE-2021-33966: Cross site scripting (XSS) vulnerability in spotweb 1.4.9, allows authenticated attackers to execute arbitrary

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-33966 is a medium-severity flaw (CVSS 5.4) 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 spotweb 1.4.9, allows authenticated attackers to execute arbitrary code via crafted GET request to the login page.

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	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-01-21
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

2022-01-21 19:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

spotweb project spotweb DOWNGRADE

Affected: 1.4.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.4.9 (Debian / Ubuntu)

apt-cache madison spotweb sudo apt install spotweb=<VERSION_BEFORE_1.4.9> sudo apt-mark hold spotweb

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

dnf --showduplicates list spotweb sudo dnf downgrade spotweb-<VERSION_BEFORE_1.4.9> sudo dnf versionlock add spotweb

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-2021-33966?

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

Is CVE-2021-33966 being exploited?

CVE-2021-33966 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-2021-33966 affect?

CVE-2021-33966 affects spotweb. Severity is medium (CVSS 5.4). Cross site scripting (XSS) vulnerability in spotweb 1.4.9, allows authenticated attackers to execute arbitrary code via crafted GET request to the login page.

How urgent is CVE-2021-33966?

Priority 39/100. Public exploit reference

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-2021-40970 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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