CVE-2009-0312: Cross-site scripting (XSS) vulnerability in the antispam feature (security/antispam.py) in MoinMoin 1.7 and 1.

Routine

MEDIUM 4.3DOWNGRADE

CVE-2009-0312 is a medium-severity flaw (CVSS 4.3) affecting moinmoin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in the antispam feature (security/antispam.py) in MoinMoin 1.7 and 1.8.1 allows remote attackers to inject arbitrary web script or HTML via crafted, disallowed content.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-79
Published	2009-01-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: moinmoin

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

Am I affected?

Timeline

2009-01-28 01:30 UTCPublished CVE record published
2026-06-16 23:04 UTCUpdated Record last modified

moinmoin moinmoin DOWNGRADE

Affected: 1.7.0 · 1.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.0 (Debian / Ubuntu)

apt-cache madison moinmoin sudo apt install moinmoin=<VERSION_BEFORE_1.7.0> sudo apt-mark hold moinmoin

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

dnf --showduplicates list moinmoin sudo dnf downgrade moinmoin-<VERSION_BEFORE_1.7.0> sudo dnf versionlock add moinmoin

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-2009-0312?

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

Is CVE-2009-0312 being exploited?

CVE-2009-0312 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-2009-0312 affect?

CVE-2009-0312 affects moinmoin. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the antispam feature (security/antispam.py) in MoinMoin 1.7 and 1.8.1 allows remote attackers to inject arbitrary web script or HTML via crafted, disallowed content.

How urgent is CVE-2009-0312?

Priority 36/100. No elevated risk signals yet.

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References

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