CVE-2011-5303: Cross-site scripting (XSS) vulnerability in Spitfire CMS 1.0.436 allows remote attackers to inject arbitrary w

Routine

MEDIUM 4.3DOWNGRADE

CVE-2011-5303 is a medium-severity flaw (CVSS 4.3) affecting spitfire. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in Spitfire CMS 1.0.436 allows remote attackers to inject arbitrary web script or HTML via a cms_username cookie.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-79
Published	2015-01-01
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: clausmuus

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-01-01 11:59 UTCPublished CVE record published
2026-06-16 23:36 UTCUpdated Record last modified

clausmuus spitfire DOWNGRADE

Affected: 1.0436

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0436

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0436 (Debian / Ubuntu)

apt-cache madison spitfire sudo apt install spitfire=<VERSION_BEFORE_1.0436> sudo apt-mark hold spitfire

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

dnf --showduplicates list spitfire sudo dnf downgrade spitfire-<VERSION_BEFORE_1.0436> sudo dnf versionlock add spitfire

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-2011-5303?

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

Is CVE-2011-5303 being exploited?

CVE-2011-5303 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-2011-5303 affect?

CVE-2011-5303 affects spitfire. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in Spitfire CMS 1.0.436 allows remote attackers to inject arbitrary web script or HTML via a cms_username cookie.

How urgent is CVE-2011-5303?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2022-47083 HIGH 8.8 DOWNGRADE A PHP Object Injection vulnerability in the unserialize() function Spitfire CMS v1.0.475 allows authenticated

References

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