A Blob URL can violate origin attribute segregation, allowing it to be accessed from a private browsing tab and for data to be passed…

Description

A Blob URL can violate origin attribute segregation, allowing it to be accessed from a private browsing tab and for data to be passed between the private browsing tab and a normal tab. This could allow for the leaking of private information specific to the private browsing context. This issue is mitigated by the requirement that the user enter the Blob URL manually in order for the access violation to occur. This vulnerability affects Firefox < 58.

Scores

EPSS (exploitation in 30 days)

1.1% · top 34% of all CVEs (4 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Weakness

• Manually entered blob URL can be accessed by subsequent private browsing tabs
• CWE-200 (opens in a new tab)All about CWE-200 and its CVEs

Affected products

• Mozilla · Firefox

  • affected unspecified – < 58

References (5)

• 1040270 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
• USN-3544-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• 102786 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• https://www.mozilla.org/security/advisories/mfsa2018-02/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://bugzilla.mozilla.org/show_bug.cgi?id=1421099 (opens in a new tab)x_refsource_CONFIRMx_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-2018-5108](https://trackcve.app/badge/CVE-2018-5108.svg)](https://trackcve.app/cve/CVE-2018-5108)

Record last updated 5 Aug 2024, 05:26 UTC.