CVE-2026-87505 | Incorrect authorization in FileSystem in Google Chrome prior to 153.0.8010.36 allows bypass of site isolation via crafted PDF
A NVD · · CVE-2026-87505
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- EPSS
- 0%
Key insight
The vulnerability requires already-compromised renderer processes and is exploited via crafted PDF files, suggesting targeted attacks following initial compromise.
Description
CVE-2026-87505 is an incorrect authorization vulnerability in the FileSystem subsystem of Google Chrome prior to version 153.0.8010.36. An attacker who has already compromised the renderer process can bypass site isolation security mechanisms via a crafted PDF file. The vulnerability has medium severity and thus requires a prior renderer process compromise vector (e.g., via browser exploit or malicious web content). The attack vector targets the sandbox isolation that prevents websites from spying on each other.
Risk score
- cvss base
- 0.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 0.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational