What’s Vulnerable › Vulnerabilities

CVE-2024-45489

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-09-20 · updated 2026-06-17
• Weakness: CWE-284

Description

Arc before 2024-08-26 allows remote code execution in JavaScript boosts. Boosts that run JavaScript cannot be shared by default; however (because of misconfigured Firebase ACLs), it is possible to create or update a boost using another user's ID. This installs the boost in the victim's browser and runs arbitrary Javascript on that browser in a privileged context. NOTE: this is a no-action cloud vulnerability with zero affected users.

Affected products

• The Browser Company Arc: before 2024-08-26 — fixed in 2024-08-26

How to fix

Upgrade to a fixed version: The Browser Company Arc 2024-08-26. Check the vendor advisory for mitigations.

References

• https://arc.net/blog/CVE-2024-45489-incident-response
• https://kibty.town/blog/arc/
• https://news.ycombinator.com/item?id=41597250

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