CVE catalog

CVE-2021-33829

ckeditor3: CVE-2021-33829

[CVE catalog]

Severity
Medium
Published
Source
[NVD] · [CVE record]
EPSS
3.19% · Oct 25, 2026

A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!> is mishandled.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianckeditorbookworm4.19.1+dfsg-1fixed
Debianckeditor3bookworm3.6.6.1+dfsg-7vulnerable
Ubuntuckeditorpro4.4.4+dfsg1-3vulnerable
Ubuntuckeditorpro4.5.6+dfsg-1vulnerable
Ubuntuckeditorpro4.5.7+dfsg-1vulnerable
Ubuntuckeditorpro4.5.7+dfsg-2vulnerable
Ubuntuckeditorpro4.5.7+dfsg-2ubuntu0.16.04.1~esm1fixed
Ubuntuckeditor18.044.5.7+dfsg-2vulnerable
Ubuntuckeditor18.044.5.7+dfsg-2ubuntu0.18.04.1fixed
Ubuntuckeditor20.044.11.1+dfsg-1vulnerable
Ubuntuckeditor20.044.12.1+dfsg-1vulnerable
Ubuntuckeditor20.044.12.1+dfsg-1ubuntu0.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianckeditorsourcebookworm4.16.0+dfsg-2not yet assignedNot reportedNot reported
Debianckeditor3sourcebookworm(unfixed)not yet assignedNot reported[1015217]
Ubuntuckeditordebpro4.5.7+dfsg-2ubuntu0.16.04.1~esm1Not reportedUBUNTU-CVE-2021-33829Not reported
Ubuntuckeditordeb18.044.5.7+dfsg-2ubuntu0.18.04.1Not reportedUBUNTU-CVE-2021-33829Not reported
Ubuntuckeditordeb20.044.12.1+dfsg-1ubuntu0.1Not reportedUBUNTU-CVE-2021-33829Not reported

[Debian bug #1015217]

Notes

[bookworm] ckeditor3: Minor issue, only used by Horde editor

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [ckeditor3]Affected
    Details (2)

    • 3.6.6.1+dfsg-7 · all · bookworm

      Affected

      dsa · ckeditor3 · debian · bookworm; dsa · ckeditor3 · debian · 12

    • 3.6.6.1+dfsg-7 · all · bookworm

      Affected

      dsa · ckeditor3 · debian · bookworm; dsa · ckeditor3 · debian · 12

  • [ckeditor]Fixed
    Details (2)

    • 4.19.1+dfsg-1 · all · bookworm

      Fixed · Fixed: 4.16.0+dfsg-2

      dsa · ckeditor · debian · bookworm; dsa · ckeditor · debian · 12

    • 4.19.1+dfsg-1 · all · bookworm

      Fixed · Fixed: 4.16.0+dfsg-2

      dsa · ckeditor · debian · bookworm; dsa · ckeditor · debian · 12

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]