CVE-2006-6991: Cross-domain vulnerability in Fast Browser Pro 8.1 allows remote attackers to access restricted information fr

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HIGH 7.8DOWNGRADE

CVE-2006-6991 is a high-severity flaw (CVSS 7.8) affecting fast browser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-domain vulnerability in Fast Browser Pro 8.1 allows remote attackers to access restricted information from other domains via an object tag with a data parameter that references a link on the attacker's originating site that specifies a Location HTTP header that references the target site, which then makes that content available through the outerHTML attribute of the object, a similar vulnerability to CVE-2006-3280.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Published	2007-02-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: fast browser

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-02-09 01:28 UTCPublished CVE record published
2026-06-16 22:34 UTCUpdated Record last modified

fast browser fast browser DOWNGRADE

Affected: pro_8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before pro_8.1

1. Check installed version

apt-cache policy fast-browser || rpm -q fast-browser || fast-browser --version

2. No fixed release: DOWNGRADE to a release before pro_8.1 (Debian / Ubuntu)

apt-cache madison fast-browser sudo apt install fast-browser=<VERSION_BEFORE_pro_8.1> sudo apt-mark hold fast-browser

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fast-browser sudo dnf downgrade fast-browser-<VERSION_BEFORE_pro_8.1> sudo dnf versionlock add fast-browser

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-6991?

fast browser: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-6991 being exploited?

CVE-2006-6991 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-6991 affect?

CVE-2006-6991 affects fast browser. Severity is high (CVSS 7.8). Cross-domain vulnerability in Fast Browser Pro 8.1 allows remote attackers to access restricted information from other domains via an object tag with a data parameter that references a link on the attacker's originating site that specifies

How urgent is CVE-2006-6991?

Priority 45/100. High severity

References

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