CVE-2007-0552: Cross-site scripting (XSS) vulnerability in install/default/error404.html in Oh no! Not another CMS (Onnac) 0.

This month

MEDIUM 6.8DOWNGRADE

CVE-2007-0552 is a medium-severity flaw (CVSS 6.8) affecting oh no not another cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in install/default/error404.html in Oh no! Not another CMS (Onnac) 0.0.8.4 and earlier allows remote attackers to inject arbitrary web script or HTML via the error_url parameter.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Published	2007-01-29
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: oh no not another cms

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

Am I affected?

Timeline

2007-01-29 17:28 UTCPublished CVE record published
2026-06-16 22:35 UTCUpdated Record last modified

oh no not another cms oh no not another cms DOWNGRADE

Affected: 0.0.8.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.8.4

1. Check installed version

apt-cache policy oh-no-not-another-cms || rpm -q oh-no-not-another-cms || oh-no-not-another-cms --version

2. No fixed release: DOWNGRADE to a release before 0.0.8.4 (Debian / Ubuntu)

apt-cache madison oh-no-not-another-cms sudo apt install oh-no-not-another-cms=<VERSION_BEFORE_0.0.8.4> sudo apt-mark hold oh-no-not-another-cms

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

dnf --showduplicates list oh-no-not-another-cms sudo dnf downgrade oh-no-not-another-cms-<VERSION_BEFORE_0.0.8.4> sudo dnf versionlock add oh-no-not-another-cms

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-2007-0552?

oh no not another cms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-0552 being exploited?

CVE-2007-0552 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-2007-0552 affect?

CVE-2007-0552 affects oh no not another cms. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in install/default/error404.html in Oh no! Not another CMS (Onnac) 0.0.8.4 and earlier allows remote attackers to inject arbitrary web script or HTML via the error_url parameter.

How urgent is CVE-2007-0552?

Priority 42/100. No elevated risk signals yet.

References

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