CVE-2021-36387: In Yellowfin before 9.6.1 there is a Stored Cross-Site Scripting vulnerability in the video embed functionalit

Q: How do I fix CVE-2021-36387?

yellowfin: upgrade to 9.6.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-36387 being exploited?

CVE-2021-36387 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-2021-36387 affect?

CVE-2021-36387 affects yellowfin. Severity is medium (CVSS 5.4). In Yellowfin before 9.6.1 there is a Stored Cross-Site Scripting vulnerability in the video embed functionality exploitable through a specially crafted HTTP POST request to the page "ActivityStreamAjax.i4".

Q: How urgent is CVE-2021-36387?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2021-36387 is a medium-severity flaw (CVSS 5.4) affecting yellowfin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Yellowfin before 9.6.1 there is a Stored Cross-Site Scripting vulnerability in the video embed functionality exploitable through a specially crafted HTTP POST request to the page "ActivityStreamAjax.i4".

Why this priority

No elevated risk signals yet

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	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-79, CWE-639
Published	2021-10-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yellowfinbi

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

Am I affected?

Timeline

2021-10-14 19:15 UTCPublished CVE record published
2026-06-17 03:58 UTCUpdated Record last modified

yellowfinbi yellowfin UPGRADE

Affected: < 9.6.1

Fixed in: 9.6.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 9.6.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yellowfin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yellowfin

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-2021-36387?

yellowfin: upgrade to 9.6.1. Exact commands for each OS are on this page.

Is CVE-2021-36387 being exploited?

CVE-2021-36387 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-2021-36387 affect?

CVE-2021-36387 affects yellowfin. Severity is medium (CVSS 5.4). In Yellowfin before 9.6.1 there is a Stored Cross-Site Scripting vulnerability in the video embed functionality exploitable through a specially crafted HTTP POST request to the page "ActivityStreamAjax.i4".

How urgent is CVE-2021-36387?

Priority 37/100. No elevated risk signals yet.

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References

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