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🛡️ CVE-2026-47759 — tinymce

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-79 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes

Impact

Stored XSS vulnerability via unsanitized data-mce-* attributes (data-mce-href, data-mce-src, data-mce-style). Allows attackers to inject malicious values that override safe attributes during serialization, bypassing validation.

Patches

Patched by stripping unsafe data-mce-* attributes during parsing. Users should upgrade to the latest patched versions (5 LTS, 7.x, 8.x).

Workarounds

No official workaround available.

Fix

To avoid this vulnerability:

Upgrade to TinyMCE 8.5.1 or higher.

Upgrade to TinyMCE 7.9.3 or higher.

Upgrade to TinyMCE 5.11.1 LTS or higher for TinyMCE 5.x (only available as part of commercial [long-term support](https://www.tiny.cloud/long-term-support/) contract).

Acknowledgements

Tiny thanks [Tadi Kadango](https://github.com/mtrill47) ([website](https://tadiwakadango.com/)) and [Ivan Babenko](https://github.com/he1d3n) for their help identifying this vulnerability.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: None.

Weakness class

CVE-2026-47759 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-47759 is recorded against 2 packages.

  • tinymce (from 8.0.0 up to 8.5.1)
  • tinymce/tinymce (from 8.0.0 up to 8.5.1)

Timeline and source

Published on 5 June 2026 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)
www.tiny.cloud (Web)
www.tiny.cloud (Web)

Other advisories for this package

tinymce has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-79: Cross-site Scripting (XSS)) in other software:

CVE-2026-47759 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CWE CWE-79
Public Exploit ✅ No
Source OSV
Published 2026-06-05
Updated 2026-08-20
Modified 2026-07-07

Affected Packages

Software From version Fixed in
tinymce 8.0.0 8.5.1
tinymce/tinymce 8.0.0 8.5.1

Site Security Check

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