CVE-2002-0270: Opera, when configured with the "Determine action by MIME type" option disabled, interprets an object as an HT

Routine

MEDIUM 4.3DOWNGRADE

CVE-2002-0270 is a medium-severity flaw (CVSS 4.3) affecting opera web browser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Opera, when configured with the "Determine action by MIME type" option disabled, interprets an object as an HTML document even when its MIME Content-Type is text/plain, which could allow remote attackers to execute arbitrary script in documents that the user does not expect, possibly through web applications that use a text/plain type to prevent cross-site scripting attacks.

Why this priority

EPSS top 8%: very likely to be exploited

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	4.7% (top 8%)
CISA exploited list	No
Weakness	CWE-79
Published	2002-05-29
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: opera software

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

Am I affected?

Timeline

2002-05-29 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

opera software opera web browser DOWNGRADE

Affected: 9.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.10

1. Check installed version

apt-cache policy opera-web-browser || rpm -q opera-web-browser || opera-web-browser --version

2. No fixed release: DOWNGRADE to a release before 9.10 (Debian / Ubuntu)

apt-cache madison opera-web-browser sudo apt install opera-web-browser=<VERSION_BEFORE_9.10> sudo apt-mark hold opera-web-browser

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

dnf --showduplicates list opera-web-browser sudo dnf downgrade opera-web-browser-<VERSION_BEFORE_9.10> sudo dnf versionlock add opera-web-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-2002-0270?

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

Is CVE-2002-0270 being exploited?

CVE-2002-0270 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-2002-0270 affect?

CVE-2002-0270 affects opera web browser. Severity is medium (CVSS 4.3). Opera, when configured with the "Determine action by MIME type" option disabled, interprets an object as an HTML document even when its MIME Content-Type is text/plain, which could allow remote attackers to execute arbitrary script in docum

How urgent is CVE-2002-0270?

Priority 38/100. EPSS top 8%: very likely to be exploited

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CVE-2002-2332 MEDIUM 5.0 DOWNGRADE Buffer overflow in Opera 6.01 allows remote attackers to cause a denial of service (crash) via an IMG tag with
CVE-2002-2311 MEDIUM 6.4 DOWNGRADE DOWNGRADE Microsoft Internet Explorer 6.0 and possibly others allows remote attackers to upload arbitrary file contents
CVE-2002-1091 HIGH 7.5 DOWNGRADE DOWNGRADE Netscape 6.2.3 and earlier, and Mozilla 1.0.1, allow remote attackers to corrupt heap memory and execute arbit

References

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