CVE-2022-22759

CRITICALNVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2022-12-22. NVD baseline CVSS 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.6Exploit: Elevated riskExposed: 0

A fix is available — apply it.

If a document created a sandboxed iframe without allow-scripts, and subsequently appended an element to the iframe's document that e.g. had a JavaScript event handler - the event handler would have run despite the iframe's sandbox. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
59(Track*)
EG Risk 59/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity96% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

December 22, 2022

Last Modified

April 16, 2025

Advisory Details (4)

Auto-updated Jul 14, 2026
No patch confirmed yet.
generic

1739957 - (CVE-2022-22759) Appending elements to sandboxed iframe can trigger javascript execution even if allow-scripts is not set

https://bugzilla.mozilla.org/show_bug.cgi?id=1739957
generic

Security Vulnerabilities fixed in Thunderbird 91.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2022-06/
generic

Security Vulnerabilities fixed in Firefox ESR 91.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2022-05/
generic

Security Vulnerabilities fixed in Firefox 97 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2022-04/

Vendor Advisories for CVE-2022-22759(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-locale-ast (97.0+build2-0ubuntu0.21.10.1) @ impish2026-05-25ubuntu
ubuntuthunderbird-locale-id (1:91.7.0+build2-0ubuntu0.21.10.1) @ impish2026-05-25ubuntu
redhatthunderbird-0:91.6.0-1.el8_42022-02-15redhat
redhatthunderbird-0:91.6.0-1.el8_12022-02-15redhat
redhatthunderbird-0:91.6.0-1.el7_92022-02-15redhat
redhatthunderbird-0:91.6.0-1.el8_52022-02-15redhat
redhatthunderbird-0:91.6.0-1.el8_22022-02-15redhat
redhatfirefox-0:91.6.0-1.el8_42022-02-14redhat
redhatfirefox-0:91.6.0-1.el7_92022-02-14redhat
redhatfirefox-0:91.6.0-1.el8_52022-02-14redhat
redhatfirefox-0:91.6.0-1.el8_12022-02-14redhat
redhatfirefox-0:91.6.0-1.el8_22022-02-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(10)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2022-22759?
CVE-2022-22759 is a critical vulnerability published on December 22, 2022. If a document created a sandboxed iframe without <code>allow-scripts</code>, and subsequently appended an element to the iframe's document that e.g. had a JavaScript event handler - the event handler would have run despite the iframe's sandbox. This vulnerability affects Firefox < 97, Thunderbird <…
When was CVE-2022-22759 disclosed?
CVE-2022-22759 was first published in the National Vulnerability Database on December 22, 2022, with the most recent update on April 16, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-22759 actively exploited?
CVE-2022-22759 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.1% of all scored CVEs.
What is the CVSS score of CVE-2022-22759?
CVE-2022-22759 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2022-22759?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-22759, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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