CVE-2009-3594: Cross-site scripting (XSS) vulnerability in bpost.php in BLOB Blog System before 1.2 allows remote attackers t

Routine

MEDIUM 4.3DOWNGRADE

CVE-2009-3594 is a medium-severity flaw (CVSS 4.3) affecting blog system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in bpost.php in BLOB Blog System before 1.2 allows remote attackers to inject arbitrary web script or HTML via the postid parameter.

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	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-79
Published	2009-10-08
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: blob

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

Am I affected?

Timeline

2009-10-08 17:30 UTCPublished CVE record published
2026-06-16 23:11 UTCUpdated Record last modified

blob blog system DOWNGRADE

Affected: 1.0 · 1.1 · 1.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy blog-system || rpm -q blog-system || blog-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison blog-system sudo apt install blog-system=<VERSION_BEFORE_1.0> sudo apt-mark hold blog-system

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

dnf --showduplicates list blog-system sudo dnf downgrade blog-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add blog-system

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-2009-3594?

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

Is CVE-2009-3594 being exploited?

CVE-2009-3594 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-2009-3594 affect?

CVE-2009-3594 affects blog system. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in bpost.php in BLOB Blog System before 1.2 allows remote attackers to inject arbitrary web script or HTML via the postid parameter.

How urgent is CVE-2009-3594?

Priority 31/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

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References

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