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CVE-2017-7787
Same-origin policy protections can be bypassed on pages with embedded iframes during page reloads, allowing the iframes to access content…
High7.5EPSS 2.3%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
Same-origin policy protections can be bypassed on pages with embedded iframes during page reloads, allowing the iframes to access content on the top level page, leading to information disclosure. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Timeline
ID reserved
By mozilla
- 14 months later
· 14 months later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 2.3% · top 17% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- Same-origin policy bypass with iframes through page reloads
- CWE-200 (opens in a new tab)All about CWE-200 and its CVEs
Affected products
- affected unspecified – < 52.3
- affected unspecified – < 52.3
- affected unspecified – < 55
References (11)
- https://www.mozilla.org/security/advisories/mfsa2017-19/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-20/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1322896 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3968 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-18/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2017:2456 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 100234 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- RHSA-2017:2534 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 1039124 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- GLSA-201803-14 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- DSA-3928 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2017-7787)Record last updated .