How severe is CVE-2004-1157?

CVE-2004-1157 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2004-1157 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-1157?

CVE-2004-1157 affects Opera Opera Browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2004-1157?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2004-1157 published?

CVE-2004-1157 was published on 2005-01-10 and last updated on 2026-06-16.

CVE-2004-1157

CVE-2004-1157 is a high-severity vulnerability in Opera Opera Browser with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Opera Opera Browser
Published: 2005-01-10
Last modified: 2026-06-16

Description

Opera 7.x up to 7.54, and possibly other versions, allows remote attackers to spoof arbitrary web sites by injecting content from one window into a target window whose name is known but resides in a different domain, as demonstrated using a pop-up window on a trusted web site, aka the "window injection" vulnerability.

Frequently asked questions

What is CVE-2004-1157?: Opera 7.x up to 7.54, and possibly other versions, allows remote attackers to spoof arbitrary web sites by injecting content from one window into a target window whose name is known but resides in a different domain, as demonstrated using a pop-up window on a trusted web site, aka the "window injection" vulnerability.
How severe is CVE-2004-1157?: CVE-2004-1157 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2004-1157 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-1157?: CVE-2004-1157 affects Opera Opera Browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2004-1157?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2004-1157 published?: CVE-2004-1157 was published on 2005-01-10 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:opera:opera_browser:*:*:*:*:*:*:*:*

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