CVE-2021-28833

Name: CVE-2021-28833
Creator: NVD / NIST
Published: 2021-06-21T13:15:08.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2021-28833 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

Description

Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.74%

49.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions	Update
Increments	Qiita\	< 0.34.0	Markdown

References

https://github.com/increments/qiita-markdown/releasesThird Party Advisory
https://vuln.ryotak.me/advisories/50Third Party Advisory
https://github.com/increments/qiita-markdown/releasesThird Party Advisory
https://vuln.ryotak.me/advisories/50Third Party Advisory

Timeline

Published: Jun 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28833?

Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.

How severe is CVE-2021-28833?

CVE-2021-28833 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28833?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28833?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST