What is CVE-2023-45819?

CVE-2023-45819 is a medium-severity vulnerability in Tiny Tinymce, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-10-19.

How severe is CVE-2023-45819?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2023-45819 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Tiny Tinymce

CVE-2023-45819

TinyMCE is an open source rich text editor. A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s Notification Manager API. The vulnerability exploits TinyMCE's unfiltered notification system, which is used in error handling. The conditions for this exploit requires carefully crafted malicious content to have been inserted into the editor and a notification to have been triggered. When a notification was opened, the HTML within the text argument was displayed unfiltered in the notification. The vulnerability allowed arbitrary JavaScript execution when an notification presented in the TinyMCE UI for the current user. This issue could also be exploited by any integration which uses a TinyMCE notification to display unfiltered HTML content. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring that the HTML displayed in the notification is sanitized, preventing the exploit. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-10-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Tiny Tinymce
Tinymce — versions < 5.10.8, >= 6.0.0, < 6.7.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

philipsinnott/cve-2023-45819

References

github.com/tinymce/tinymce/security/advisories/GHSA-hgqx-r2hp-jr38 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-45819?: CVE-2023-45819 is a medium-severity vulnerability in Tiny Tinymce, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-10-19.
How severe is CVE-2023-45819?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2023-45819 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.