When an "iframe" has a "sandbox" attribute and its content is specified using "srcdoc", that content does not inherit the containing page's…

Published 8 y ago 2018-06-11 · modified 4 mo ago 2026-06-17 · JSON

CVSS

9.8

v3.0 · NVD

CISA KEV

not known exploited

EPSS

2.3%

percentile 83%

Public exploits

none known

When an "iframe" has a "sandbox" attribute and its content is specified using "srcdoc", that content does not inherit the containing page's Content Security Policy (CSP) as it should unless the sandbox attribute included "allow-same-origin". This vulnerability affects Firefox < 55.

Exploit prediction (EPSS)

2.26% probability of exploitation in the next 30 days, higher than 83% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
NVD	3.0	9.8	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
NVD	2.0	7.5	`AV:N/AC:L/Au:N/C:P/I:P/A:P`

Affected products

Mozilla Firefox

Classification

Weakness

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

bugzilla.mozilla.org /show_bug.cgi?id=1073952 · x_refsource_CONFIRM, x_transferred
mozilla.org /security/advisories/mfsa2017-18/ · x_refsource_CONFIRM, x_transferred
securityfocus.com /bid/100379 · vdb-entry, x_refsource_BID, x_transferred
securitytracker.com /id/1039124 · vdb-entry, x_refsource_SECTRACK, x_transferred

Sources

CVE List: CVE-2017-7788
NVD: CVE-2017-7788

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.