How severe is CVE-2020-6159?

CVE-2020-6159 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-6159 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-6159?

CVE-2020-6159 affects Opera. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-6159?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-6159 published?

CVE-2020-6159 was published on 2020-12-23 and last updated on 2026-06-17.

CVE-2020-6159

CVE-2020-6159 is a medium-severity vulnerability in Opera with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Opera
Published: 2020-12-23
Last modified: 2026-06-17

Description

URLs using “javascript:” have the protocol removed when pasted into the address bar to protect users from cross-site scripting (XSS) attacks, but in certain circumstances this removal was not performed. This could allow users to be socially engineered to run an XSS attack against themselves. This vulnerability affects Opera for Android versions below 61.0.3076.56532.

Frequently asked questions

What is CVE-2020-6159?: URLs using “javascript:” have the protocol removed when pasted into the address bar to protect users from cross-site scripting (XSS) attacks, but in certain circumstances this removal was not performed. This could allow users to be socially engineered to run an XSS attack against themselves. This vulnerability affects Opera for Android versions below 61.0.3076.56532.
How severe is CVE-2020-6159?: CVE-2020-6159 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-6159 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-6159?: CVE-2020-6159 affects Opera. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-6159?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-6159 published?: CVE-2020-6159 was published on 2020-12-23 and last updated on 2026-06-17.

References

https://security.opera.com/cross-site-scripting-in-ofa-opera-security-advisories/

Affected products (1)

cpe:2.3:a:opera:opera:*:*:*:*:*:android:*:*

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