CVE-2011-5138: Cross-site scripting (XSS) vulnerability in member.php in tForum b0.915 allows remote attackers to inject arbi

Routine

MEDIUM 4.3DOWNGRADE

CVE-2011-5138 is a medium-severity flaw (CVSS 4.3) affecting tforum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in member.php in tForum b0.915 allows remote attackers to inject arbitrary web script or HTML via the username parameter in a viewprofile action.

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	2012-08-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: tforum

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

Am I affected?

Timeline

2012-08-31 21:55 UTCPublished CVE record published
2026-06-16 23:36 UTCUpdated Record last modified

tforum tforum DOWNGRADE

Affected: b0.915

Fixed in: no fixed release known

Safe to downgrade to: a release before b0.915

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before b0.915 (Debian / Ubuntu)

apt-cache madison tforum sudo apt install tforum=<VERSION_BEFORE_b0.915> sudo apt-mark hold tforum

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

dnf --showduplicates list tforum sudo dnf downgrade tforum-<VERSION_BEFORE_b0.915> sudo dnf versionlock add tforum

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-2011-5138?

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

Is CVE-2011-5138 being exploited?

CVE-2011-5138 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-2011-5138 affect?

CVE-2011-5138 affects tforum. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in member.php in tForum b0.915 allows remote attackers to inject arbitrary web script or HTML via the username parameter in a viewprofile action.

How urgent is CVE-2011-5138?

Priority 35/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2011-5137 HIGH 7.5 DOWNGRADE Multiple SQL injection vulnerabilities in tForum b0.915 allow remote attackers to execute arbitrary SQL comman
CVE-2007-0642 HIGH 7.5 DOWNGRADE SQL injection vulnerability in tForum 2.00 in the Raymond BERTHOU script collection (aka RBL - ASP) allows rem

References

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