CVE-2021-28115: The OUGC Feedback plugin before 1.8.23 for MyBB allows XSS via the comment field of feedback during an edit op

Q: How do I fix CVE-2021-28115?

ougc feedback: upgrade to 1.8.23. Exact commands for each OS are on this page.

Q: Is CVE-2021-28115 being exploited?

CVE-2021-28115 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-2021-28115 affect?

CVE-2021-28115 affects ougc feedback. Severity is medium (CVSS 6.1). The OUGC Feedback plugin before 1.8.23 for MyBB allows XSS via the comment field of feedback during an edit operation.

Q: How urgent is CVE-2021-28115?

Priority 41/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2021-28115 is a medium-severity flaw (CVSS 6.1) affecting ougc feedback. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The OUGC Feedback plugin before 1.8.23 for MyBB allows XSS via the comment field of feedback during an edit operation.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-03-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ougc feedback project

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

Am I affected?

Timeline

2021-03-09 22:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

ougc feedback project ougc feedback UPGRADE

Affected: < 1.8.23

Fixed in: 1.8.23

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ougc-feedback || rpm -q ougc-feedback || ougc-feedback --version

2. UPGRADE to 1.8.23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ougc-feedback

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ougc-feedback

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-2021-28115?

ougc feedback: upgrade to 1.8.23. Exact commands for each OS are on this page.

Is CVE-2021-28115 being exploited?

CVE-2021-28115 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-2021-28115 affect?

CVE-2021-28115 affects ougc feedback. Severity is medium (CVSS 6.1). The OUGC Feedback plugin before 1.8.23 for MyBB allows XSS via the comment field of feedback during an edit operation.

How urgent is CVE-2021-28115?

Priority 41/100. Public exploit reference

References

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