6.1

CVE-2023-45818: tiny tinymce Cross-site Scripting

CVSS: 6.1v3.1MediumModified
AliasesUBUNTU-CVE-2023-45818GHSA-v65r-p3vv-jjfv
Published 19-10-2023Last modified 12-09-2024
Open JSON

Vulnerability summary

CVE-2023-45818 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in tiny tinymce. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.5% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.73%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-10-2023
    PublishedVulnerability first disclosed.
  2. 12-09-2024
    Last modifiedVulnerability information updated.

Description

TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo and redo functionality. When a carefully-crafted HTML snippet passes the XSS sanitisation layer, it is manipulated as a string by internal trimming functions before being stored in the undo stack. If the HTML snippet is restored from the undo stack, the combination of the string manipulation and reparative parsing by either the browser's native [DOMParser API](https://developer.mozilla.org/en-US/docs/Web/API/DOMParser) (TinyMCE 6) or the SaxParser API (TinyMCE 5) mutates the HTML maliciously, allowing an XSS payload to be executed. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring HTML is trimmed using node-level manipulation instead of string manipulation. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.73%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

+0.11 pp

From 0.62% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.73%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Tinymce2 products
  • tinymce≥ 6.0.0, < 6.7.1 | < 5.10.8
  • tinymce< 5.10.8 | ≥ 6.0.0, < 6.7.1
Npm1 product
  • tinymce≥ 6.0.0, < 6.7.1 | < 5.10.8
NuGet1 product
  • TinyMCE≥ 6.0.0, < 6.7.1 | < 5.10.8
Tiny1 product
  • tinymce< 5.10.8 | ≥ 6.0.0, < 6.7.1
Ubuntu1 product
  • tinymceAll versions (No fix recorded)

5 vendors · 6 products

References

10 links