CVE-2006-0511: Blackboard Academic Suite 6.0 and earlier does not properly clear session information when de-authenticating a

Routine

MEDIUM 4.3DOWNGRADEDOWNGRADE

CVE-2006-0511 is a medium-severity flaw (CVSS 4.3) affecting blackboard, blackboard academic suite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Blackboard Academic Suite 6.0 and earlier does not properly clear session information when de-authenticating a user who is idle, which allows subsequent users to log in as the previous user and gain privileges. NOTE: the vendor has disputed this issue, saying that "This is a customer specific issue related to their Kerberos authentication single sign-on application and not a vulnerability in the Blackboard product.

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	0.4% (top 70%)
CISA exploited list	No
Published	2006-02-01
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: blackboard

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

Am I affected?

Timeline

2006-02-01 23:02 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

blackboard blackboard DOWNGRADE

Affected: 5.0 · 5.0.2 · 5.5 · 5.5.1 · 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison blackboard sudo apt install blackboard=<VERSION_BEFORE_5.0> sudo apt-mark hold blackboard

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

dnf --showduplicates list blackboard sudo dnf downgrade blackboard-<VERSION_BEFORE_5.0> sudo dnf versionlock add blackboard

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.

blackboard blackboard academic suite DOWNGRADE

Affected: 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy blackboard-academic-suite || rpm -q blackboard-academic-suite || blackboard-academic-suite --version

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison blackboard-academic-suite sudo apt install blackboard-academic-suite=<VERSION_BEFORE_6.0> sudo apt-mark hold blackboard-academic-suite

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

dnf --showduplicates list blackboard-academic-suite sudo dnf downgrade blackboard-academic-suite-<VERSION_BEFORE_6.0> sudo dnf versionlock add blackboard-academic-suite

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-2006-0511?

blackboard: downgrade or apply the listed mitigation; blackboard academic suite: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0511 being exploited?

CVE-2006-0511 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-2006-0511 affect?

CVE-2006-0511 affects blackboard, blackboard academic suite. Severity is medium (CVSS 4.3). Blackboard Academic Suite 6.0 and earlier does not properly clear session information when de-authenticating a user who is idle, which allows subsequent users to log in as the previous user and gain privileges. NOTE: the vendor has dispute

How urgent is CVE-2006-0511?

Priority 23/100. No elevated risk signals yet.

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References

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