VulnerabilityPublished 5 Jun 2026Updated 7 Jul 2026

CVE-2026-47759: TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes

Affects tinymceSource GCVE Database

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Not known to be exploited · CVSS 8.7 High : upgrade to 7.9.3 soon.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score

8.7High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 7.9.3, 8.5.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Changed
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 5 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade tinymce and TinyMCE and tinymce/tinymce to 7.9.3; tinymce and TinyMCE and tinymce/tinymce to 8.5.1.

Affected software

Product	Affected	Fixed in
npmtinymce	Affected <=5.10.9	Fixed in–
npmtinymce	Affected >=6.0.0 <7.9.3	Fixed in 7.9.3
npmtinymce	Affected >=8.0.0 <8.5.1	Fixed in 8.5.1
NuGetTinyMCE	Affected <=5.10.9	Fixed in–
NuGetTinyMCE	Affected >=6.0.0 <7.9.3	Fixed in 7.9.3
NuGetTinyMCE	Affected >=8.0.0 <8.5.1	Fixed in 8.5.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available. Users should upgrade to TinyMCE 8.5.1 or higher, 7.9.3 or higher, or 5.11.1 LTS or higher (the latter requires a commercial long-term support contract). There is no official workaround available. Applying the official patches is the recommended mitigation.

Description

TinyMCE versions up to 5.10.9, from 6.0.0 up to but not including 7.9.3, and from 8.0.0 up to but not including 8.5.1 are affected by a stored Cross-Site Scripting (XSS) vulnerability. The issue arises from unsanitized data-mce-* attributes (specifically data-mce-href, data-mce-src, and data-mce-style) that allow attackers to inject malicious content bypassing validation during serialization. This vulnerability has been patched by stripping unsafe data-mce-* attributes during parsing. Users should upgrade to TinyMCE 8.5.1 or higher, 7.9.3 or higher, or 5.11.1 LTS or higher (the latter available only under commercial long-term support). No official workaround is available.

Impact

Successful exploitation allows an attacker to perform stored Cross-Site Scripting (XSS) attacks by injecting malicious script code via unsanitized data-mce-* attributes. This can lead to complete compromise of confidentiality and integrity (high impact on confidentiality and integrity), but does not affect availability. The vulnerability requires at least low privileges and user interaction (UI:R) and can be exploited remotely (AV:N).

Summary

A stored XSS vulnerability (CWE-79) exists in TinyMCE due to improper sanitization of data-mce-* prefixed attributes such as data-mce-href, data-mce-src, and data-mce-style. Attackers can inject malicious values that override safe attributes during serialization, bypassing validation controls. The vulnerability affects multiple TinyMCE versions: all versions up to 5.10.9, all versions from 6.0.0 up to but excluding 7.9.3, and all versions from 8.0.0 up to but excluding 8.5.1. The vendor fixed the issue by stripping unsafe data-mce-* attributes during parsing. The fix is included in TinyMCE versions 5.11.1 LTS, 7.9.3, and 8.5.1 and later. No official workaround exists.

CWE-79Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 8 Jul 2026, 13:49 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

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