CVE-2021-47808: Cotonti Siena 0.9.19 contains a stored cross-site scripting vulnerability in the admin configuration panel's s

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-47808 is a medium-severity flaw (CVSS 5.4) affecting cotonti siena. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cotonti Siena 0.9.19 contains a stored cross-site scripting vulnerability in the admin configuration panel's site title parameter. Attackers can inject malicious JavaScript code through the 'maintitle' parameter to execute scripts when administrators view the 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	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: cotonti

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

Am I affected?

Timeline

2026-01-16 00:16 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

cotonti cotonti siena DOWNGRADE

Affected: 0.9.19

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.19

1. Check installed version

apt-cache policy cotonti-siena || rpm -q cotonti-siena || cotonti-siena --version

2. No fixed release: DOWNGRADE to a release before 0.9.19 (Debian / Ubuntu)

apt-cache madison cotonti-siena sudo apt install cotonti-siena=<VERSION_BEFORE_0.9.19> sudo apt-mark hold cotonti-siena

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

dnf --showduplicates list cotonti-siena sudo dnf downgrade cotonti-siena-<VERSION_BEFORE_0.9.19> sudo dnf versionlock add cotonti-siena

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-2021-47808?

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

Is CVE-2021-47808 being exploited?

CVE-2021-47808 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-2021-47808 affect?

CVE-2021-47808 affects cotonti siena. Severity is medium (CVSS 5.4). Cotonti Siena 0.9.19 contains a stored cross-site scripting vulnerability in the admin configuration panel's site title parameter. Attackers can inject malicious JavaScript code through the 'maintitle' parameter to execute scripts when admi

How urgent is CVE-2021-47808?

Priority 29/100. Public exploit reference

Related CVEs

CVE-2025-44115 MEDIUM 5.4 DOWNGRADE A vulnerability has been found in Cotonti Siena v0.9.25

References

← Back to latest CVEs