LiveActive security incident?Get immediate response
CVE Record

CVE-2017-7798: The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the...

The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code. In the worst case, this could allow arbitrary code execution when opening a malicious page with the style editor tool. This vulnerability affects Firefox ESR < 52.3 and Firefox < 55.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2017-7798 is a Mozilla Firefox Developer Tools flaw. If an affected user opened a malicious page with the Style Editor tool, the page source could be mishandled as XUL and, in the worst case, lead to arbitrary code execution. The issue concerns old Firefox versions only.

Executive priority

Prioritize remediation where outdated Firefox exists on developer or administrative systems. The impact can be severe, but the affected versions are old and exploitation evidence is not present in the provided sources.

Technical view

The vulnerability is described as XUL injection in Firefox Developer Tools caused by improper sanitization of web page source code. The documented impact is worst-case arbitrary code execution when the Style Editor opens malicious page content. Affected versions are Firefox ESR before 52.3 and Firefox before 55.

Likely exposure

Exposure is most likely on legacy workstations, developer systems, kiosks, or packaged Linux environments still running Firefox ESR < 52.3 or Firefox < 55. Current managed browsers should not be exposed if maintained above those versions.

Exploitation context

The source bundle does not indicate CISA KEV listing or active exploitation. The described scenario requires a malicious page and use of Firefox Developer Tools Style Editor on an affected version. No exploit details are provided in the bundle.

Researcher notes

Focus validation on version exposure and DevTools usage context. The core issue is source sanitization leading to XUL injection in Developer Tools. The public bundle references Mozilla advisories and Bugzilla IDs 1371586 and 1372112, but does not provide CVSS, CWE, or exploit status.

Mitigation direction

  • Upgrade Firefox to version 55 or later.
  • Upgrade Firefox ESR to version 52.3 or later.
  • Apply relevant Red Hat or Debian security updates where packaged Firefox is used.
  • Avoid using Developer Tools on untrusted pages until affected browsers are updated.
  • Check Mozilla guidance before relying on alternate mitigations.

Validation and detection

  • Inventory Firefox and Firefox ESR versions across endpoints.
  • Flag Firefox < 55 and Firefox ESR < 52.3 as vulnerable.
  • Check Linux package status against Red Hat and Debian advisories.
  • Confirm developer workstations and test images do not retain legacy browsers.
  • Document KEV status as not listed based on the provided bundle.
Prepared
Confidence
high
Sources
7

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.

description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2017-7798 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
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefox ESRunspecifiedListed
MozillaFirefoxunspecifiedListed
Weakness

CWE details

No CWE listed

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