JavaScript can be injected into an exported bookmarks file by placing JavaScript code into user-supplied tags in saved bookmarks. If the…

Description

JavaScript can be injected into an exported bookmarks file by placing JavaScript code into user-supplied tags in saved bookmarks. If the resulting exported HTML file is later opened in a browser this JavaScript will be executed. This could be used in social engineering and self-cross-site-scripting (self-XSS) attacks if users were convinced to add malicious tags to bookmarks, export them, and then open the resulting file. This vulnerability affects Firefox < 57.

Scores

EPSS (exploitation in 30 days)

1.1% · top 34% of all CVEs (3 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.

Weakness

• Exported bookmarks do not strip script elements from user-supplied tags
• CWE-79 (opens in a new tab)Other CVEs with CWE-79

Affected products

• Mozilla · Firefox

  • affected unspecified – < 57

References (4)

• https://bugzilla.mozilla.org/show_bug.cgi?id=1366420 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://www.mozilla.org/security/advisories/mfsa2017-24/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• 101832 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• 1039803 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_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

[![CVE-2017-7840](https://trackcve.app/badge/CVE-2017-7840.svg)](https://trackcve.app/cve/CVE-2017-7840)

Record last updated 5 Aug 2024, 16:19 UTC.