CVE-2021-36747: Blackboard Learn through 9.1 allows XSS by an authenticated user via the Feedback to Learner form.

Q: How do I fix CVE-2021-36747?

blackboard learn: upgrade to newer than 9.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-36747 being exploited?

CVE-2021-36747 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-36747 affect?

CVE-2021-36747 affects blackboard learn. Severity is medium (CVSS 5.4). Blackboard Learn through 9.1 allows XSS by an authenticated user via the Feedback to Learner form.

Q: How urgent is CVE-2021-36747?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2021-36747 is a medium-severity flaw (CVSS 5.4) affecting blackboard learn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Blackboard Learn through 9.1 allows XSS by an authenticated user via the Feedback to Learner form.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-07-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: blackboard

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-20 21:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

blackboard blackboard learn UPGRADE

Affected: <= 9.1

Fixed in: newer than 9.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 9.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade blackboard-learn

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade blackboard-learn

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-36747?

blackboard learn: upgrade to newer than 9.1. Exact commands for each OS are on this page.

Is CVE-2021-36747 being exploited?

CVE-2021-36747 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-2021-36747 affect?

CVE-2021-36747 affects blackboard learn. Severity is medium (CVSS 5.4). Blackboard Learn through 9.1 allows XSS by an authenticated user via the Feedback to Learner form.

How urgent is CVE-2021-36747?

Priority 36/100. Public exploit reference

Related CVEs

CVE-2022-39196 MEDIUM 6.5 DOWNGRADE Blackboard Learn 1.10.1 allows remote authenticated users to read unintended files by entering student credent
CVE-2021-36746 MEDIUM 5.4 UPGRADE Blackboard Learn through 9.1 allows XSS by an authenticated user via the Assignment Instructions HTML editor.

References

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