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CVE Record

CVE-2024-21911: Cross-site scripting vulnerability in TinyMCE

TinyMCE versions before 5.6.0 are affected by a stored cross-site scripting vulnerability. An unauthenticated and remote attacker could insert crafted HTML into the editor resulting in arbitrary JavaScript execution in another user's browser.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

TinyMCE before 5.6.0 can store unsafe HTML that later runs JavaScript in another user’s browser. The main business risk is account-session abuse or data exposure inside applications that let untrusted users submit content through TinyMCE.

Executive priority

Treat this as a moderate priority unless TinyMCE is exposed to anonymous or customer-submitted content viewed by staff or administrators; then prioritize remediation promptly.

Technical view

CVE-2024-21911 is a stored cross-site scripting flaw in TinyMCE before 5.6.0. The CVSS 3.1 score is 6.1, network-reachable, low complexity, no privileges required, user interaction required, changed scope, with low confidentiality and integrity impact.

Likely exposure

Exposure is most likely in web applications embedding TinyMCE versions before 5.6.0, especially where unauthenticated or low-trust users can save editor content that other users later view.

Exploitation context

The provided bundle reports no KEV listing and gives no cited evidence of active exploitation. Exploitation requires stored content to be viewed by another user, so risk depends heavily on application workflow and trust boundaries.

Researcher notes

The affected-version statement is clear: TinyMCE before 5.6.0. The bundle’s structured affected metadata is sparse, so validate real exposure through dependency and deployment evidence rather than relying only on CPE matching.

Mitigation direction

  • Upgrade TinyMCE to 5.6.0 or later where affected versions are present.
  • Check TinyMCE advisory and 5.6 release notes for vendor-specific guidance.
  • Prioritize internet-facing forms accepting untrusted editor content.
  • Review server-side content sanitization for stored rich-text submissions.
  • Inventory bundled or transitive TinyMCE copies in deployed applications.

Validation and detection

  • Confirm TinyMCE versions in package manifests, lockfiles, and deployed bundles.
  • Identify routes where untrusted users can save TinyMCE content.
  • Verify stored editor content is sanitized before later rendering.
  • Check whether affected content is viewed by administrators or privileged users.
  • Document whether each application is upgraded, unaffected, or still pending remediation.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2024-21911 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
2ADP providers
6Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.1CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

6.1Medium
CVSS 3.1 vector shape for CVE-2024-21911Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Unknown vendorTinyMCETinyMCE, 0unaffected
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.