← Vulnerability feed

Vulnerability record · CVE-2021-23253 · published 11 January 2021

CVE-2021-23253: Opera mini vulnerability

Opera · Opera Mini

Opera Mini for Android below 53.1 displays URL left-aligned in the address field. This allows a malicious attacker to craft a URL with a long domain name, e.g. www.safe.opera.com.attacker.com. With the URL being left-aligned, the user will only see the front part (e.g. www.safe.opera.com…) The exact amount depends on the phone screen size but the attacker can craft a number of different domains and target different phones. Starting with version 53.1 Opera Mini displays long URLs with the top-level domain label aligned to the right of the address field which mitigates the issue.

5.3 CVSS 3.1 Medium EPSS 0.75% · top 46.8%
5.3CVSS 3.1 base score, v2 5.0
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Opera Mini for Android below 53.1 displays URL left-aligned in the address field. This allows a malicious attacker to craft a URL with a long domain name, e.g. www.safe.opera.com.attacker.com. With the URL being left-aligned, the user will only see the front part (e.g. www.safe.opera.com…) The exact amount depends on the phone screen size but the attacker can craft a number of different domains and target different phones. Starting with version 53.1 Opera Mini displays long URLs with the top-level domain label aligned to the right of the address field which mitigates the issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://security.opera.com/address-bar-spoofing-in-opera-mini-opera-security-advisories/ Vendor Advisory
https://security.opera.com/address-bar-spoofing-in-opera-mini-opera-security-advisories/ Vendor Advisory

Track CVE-2021-23253 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.5CVE-2018-16135Opera mini vulnerabilityThe Opera Mini application 47.1.2249.129326 for Android allows remote attackers to spoof the Location Permission dialog via a crafted web site.EPSS 0.54%6.1CVE-2016-4075Opera browser open redirect vulnerabilityOpera Mini 13 and Opera Stable 36 allow remote attackers to spoof the displayed URL via a crafted HTML document, related to the about:blank URL.EPSS 1.2%4.3CVE-2012-5180Opera mini information exposure vulnerabilityThe Opera Mobile application before 12.1 and Opera Mini application before 7.5 for Android do not properly implement the WebView class, which allows …EPSS 0.89%

Source: NIST National Vulnerability Database (record CVE-2021-23253), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.