CVE-2011-4451: libs/Wakka.class.php in WikkaWiki 1.3.1 and 1.3.2, when the spam_logging option is enabled, allows remote atta

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MEDIUM 4.3DOWNGRADE

CVE-2011-4451 is a medium-severity flaw (CVSS 4.3) affecting wikkawiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libs/Wakka.class.php in WikkaWiki 1.3.1 and 1.3.2, when the spam_logging option is enabled, allows remote attackers to write arbitrary PHP code to the spamlog_path file via the User-Agent HTTP header in an addcomment request. NOTE: the vendor disputes this issue because the rendering of the spamlog_path file never uses the PHP interpreter

Why this priority

EPSS top 3%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	14.2% (top 3%)
CISA exploited list	No
Published	2012-09-05
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: wikkawiki

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

Am I affected?

Timeline

2012-09-05 20:55 UTCPublished CVE record published
2026-06-16 23:34 UTCUpdated Record last modified

wikkawiki wikkawiki DOWNGRADE

Affected: 1.3.1 · 1.3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.1 (Debian / Ubuntu)

apt-cache madison wikkawiki sudo apt install wikkawiki=<VERSION_BEFORE_1.3.1> sudo apt-mark hold wikkawiki

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

dnf --showduplicates list wikkawiki sudo dnf downgrade wikkawiki-<VERSION_BEFORE_1.3.1> sudo dnf versionlock add wikkawiki

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: WikkaWiki 1.3.2 - Multiple Vulnerabilities
Metasploit: WikkaWiki 1.3.2 Spam Logging PHP Injection

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-2011-4451?

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

Is CVE-2011-4451 being exploited?

CVE-2011-4451 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-2011-4451 affect?

CVE-2011-4451 affects wikkawiki. Severity is medium (CVSS 4.3). libs/Wakka.class.php in WikkaWiki 1.3.1 and 1.3.2, when the spam_logging option is enabled, allows remote attackers to write arbitrary PHP code to the spamlog_path file via the User-Agent HTTP header in an addcomment request. NOTE: the ven

How urgent is CVE-2011-4451?

Priority 44/100. EPSS top 3%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2013-5586 MEDIUM 4.3 UPGRADE Cross-site scripting (XSS) vulnerability in wikka.php in WikkaWiki before 1.3.4-p1 allows remote attackers to
CVE-2011-4452 MEDIUM 6.8 DOWNGRADE Cross-site request forgery (CSRF) vulnerability in the AdminUsers component in WikkaWiki 1.3.1 and 1.3.2 allow
CVE-2011-4450 MEDIUM 6.4 DOWNGRADE Directory traversal vulnerability in handlers/files.xml/files.xml.php in WikkaWiki 1.3.1 and 1.3.2 allows remo
CVE-2011-4449 MEDIUM 6.8 DOWNGRADE actions/files/files.php in WikkaWiki 1.3.1 and 1.3.2, when INTRANET_MODE is enabled, supports file uploads for
CVE-2011-4448 HIGH 7.5 DOWNGRADE SQL injection vulnerability in actions/usersettings/usersettings.php in WikkaWiki 1.3.1 and 1.3.2 allows remot

References

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