CVE-2012-0958: content/unity-api.js in the unity-firefox-extension extension 2.4.1 for Firefox exposes the toDataURL function

Routine

MEDIUM 4.3DOWNGRADE

CVE-2012-0958 is a medium-severity flaw (CVSS 4.3) affecting unity-firefox-extension. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

content/unity-api.js in the unity-firefox-extension extension 2.4.1 for Firefox exposes the toDataURL function in an API call, which allows remote attackers to bypass the Same Origin Policy and obtain sensitive information via a crafted webpage.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Published	2012-12-26
Last modified	2026-06-16

Publisher (CNA): Canonical Ltd. · Vendor: ps project management team

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

Am I affected?

Timeline

2012-12-26 22:55 UTCPublished CVE record published
2026-06-16 23:38 UTCUpdated Record last modified

ps project management team unity-firefox-extension DOWNGRADE

Affected: 2.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.4.1

1. Check installed version

apt-cache policy unity-firefox-extension || rpm -q unity-firefox-extension || unity-firefox-extension --version

2. No fixed release: DOWNGRADE to a release before 2.4.1 (Debian / Ubuntu)

apt-cache madison unity-firefox-extension sudo apt install unity-firefox-extension=<VERSION_BEFORE_2.4.1> sudo apt-mark hold unity-firefox-extension

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

dnf --showduplicates list unity-firefox-extension sudo dnf downgrade unity-firefox-extension-<VERSION_BEFORE_2.4.1> sudo dnf versionlock add unity-firefox-extension

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-2012-0958?

unity-firefox-extension: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-0958 being exploited?

CVE-2012-0958 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-2012-0958 affect?

CVE-2012-0958 affects unity-firefox-extension. Severity is medium (CVSS 4.3). content/unity-api.js in the unity-firefox-extension extension 2.4.1 for Firefox exposes the toDataURL function in an API call, which allows remote attackers to bypass the Same Origin Policy and obtain sensitive information via a crafted web

How urgent is CVE-2012-0958?

Priority 34/100. No elevated risk signals yet.

Software pages

Mozilla Firefox vulnerabilities · Unity vulnerabilities

Related CVEs

CVE-2013-1055 MEDIUM 4.3 MITIGATE MITIGATE The unity-firefox-extension package could be tricked into dropping a C callback which was still in use, which
CVE-2013-1054 MEDIUM 4.3 MITIGATE MITIGATE The unity-firefox-extension package could be tricked into destroying the Unity webapps context, causing Firefo
CVE-2012-0960 HIGH 7.5 UPGRADE Unity integration extension (unity-firefox-extension) before 2.4.1 for Firefox does not properly handle callba

References

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