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CVE-2012-4142
Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, ignores some characters in HTML documents in…
Medium4.3EPSS 1.2%
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, ignores some characters in HTML documents in unspecified circumstances, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted document.
Timeline
ID reserved
By mitre
Published
- 12 years later
· 12 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
- EPSS (exploitation in 30 days)
- 1.2% · top 33% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
n/a
- affected n/a
References (5)
- http://www.opera.com/docs/changelogs/mac/1166/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.opera.com/docs/changelogs/windows/1201/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.opera.com/support/kb/view/1026/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.opera.com/docs/changelogs/mac/1201/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.opera.com/docs/changelogs/unix/1201/ (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2012-4142)Record last updated .