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No exploitation reportedFix available

CVE-2021-29272

No exploitation reported by the sources we read.

  • Published2021-03-27
  • Fixed in1.0.5
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the "script" string.

Timeline

dates in UTC
  1. 2021-03-2718:15CVE publishedNVD

Versions per branch

NVD · OSV
Microco bluemonday
BranchAffectedFixed in
1.0< 1.0.51.0.5

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • giteaCleanStartall versions · fixed in 1.13.7-r0and 1 other package
  • giteaAlpine:v3.24all versions · fixed in 1.13.7-r0
  • giteaAlpine:v3.23all versions · fixed in 1.13.7-r0
  • giteaAlpine:v3.22all versions · fixed in 1.13.7-r0
  • giteaAlpine:v3.21all versions · fixed in 1.13.7-r0
  • giteaAlpine:v3.20all versions · fixed in 1.13.7-r0
  • giteaAlpine:v3.19all versions · fixed in 1.13.7-r0
  • giteaAlpine:v3.18all versions · fixed in 1.13.7-r0

8 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Microco bluemonday to 1.0.5

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.16.1read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • NVDweakness (CWE)CWE-79read 2026-10-23
  • FIRST EPSSEPSS score0.9 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2021-05-18

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2021-03-27
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-3x58-xr87-2fcj

Frequently asked questions

What is CVE-2021-29272?

bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the "script" string.

Is CVE-2021-29272 actively exploited?

Active exploitation of CVE-2021-29272 has not been confirmed. Its EPSS score was 0.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-29272?

CVE-2021-29272 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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