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CVE-2006-2783· NVD / CVE Program· CNA mitre

Mozilla Firefox and Thunderbird before 1.5.0.4 strip the Unicode Byte-order-Mark (BOM) from a UTF-8 page before the page is passed to the pa

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 76.4% of all records.
  • Fixed version: thunderbird (Debian:12) 1.5.0.4-1; mozilla (Debian:3.1) 2:1.7.8-1sarge7.1; mozilla-firefox (Debian:3.1) 1.0.4-2sarge9.

Low priority for now. Upgrade to thunderbird (Debian:12) 1.5.0.4-1; mozilla (Debian:3.1) 2:1.7.8-1sarge7.1; mozilla-firefox (Debian:3.1) 1.0.4-2sarge9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Mozilla Firefox and Thunderbird before 1.5.0.4 strip the Unicode Byte-order-Mark (BOM) from a UTF-8 page before the page is passed to the parser, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a BOM sequence in the middle of a dangerous tag such as SCRIPT.

MediumCVSS 4.3 · v2.0—No exploit Fix available
Published
Jun 2, 2006
Updated
Jun 16, 2026
EPSS
1.6% · 76th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2006-2783

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
mozillathunderbird

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxup to 1.5.0.3 inclusive
  • mozilla thunderbirdup to 1.5.0.3 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12thunderbirdbefore 1.5.0.4-11.5.0.4-1
Debian:3.1mozillabefore 2:1.7.8-1sarge7.12:1.7.8-1sarge7.1
Debian:3.1mozilla-firefoxbefore 1.0.4-2sarge91.0.4-2sarge9
Debian:3.1mozilla-thunderbirdbefore 1.0.2-2.sarge1.0.8a1.0.2-2.sarge1.0.8a
Red Hat:enterprise_linux:3::asseamonkeybefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-chatbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-debuginfobefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-develbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-dom-inspectorbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-js-debuggerbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-mailbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-nsprbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-nspr-develbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-nssbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:3::asseamonkey-nss-develbefore 0:1.0.2-0.1.0.EL30:1.0.2-0.1.0.EL3
Red Hat:enterprise_linux:4::asdevhelpbefore 0:0.10-0.2.el40:0.10-0.2.el4
Red Hat:enterprise_linux:4::asdevhelp-debuginfobefore 0:0.10-0.2.el40:0.10-0.2.el4
Red Hat:enterprise_linux:4::asdevhelp-develbefore 0:0.10-0.2.el40:0.10-0.2.el4
Red Hat:enterprise_linux:4::asfirefoxbefore 0:1.5.0.5-0.el4.10:1.5.0.5-0.el4.1
Red Hat:enterprise_linux:4::asfirefox-debuginfobefore 0:1.5.0.5-0.el4.10:1.5.0.5-0.el4.1
Red Hat:enterprise_linux:4::asseamonkeybefore 0:1.0.3-0.el4.10:1.0.3-0.el4.1
Red Hat:enterprise_linux:4::asseamonkey-chatbefore 0:1.0.3-0.el4.10:1.0.3-0.el4.1
Red Hat:enterprise_linux:4::asseamonkey-debuginfobefore 0:1.0.3-0.el4.10:1.0.3-0.el4.1
Red Hat:enterprise_linux:4::asseamonkey-develbefore 0:1.0.3-0.el4.10:1.0.3-0.el4.1

+5

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2006-2780Jun 2, 2006 · Integer overflow in Mozilla Firefox and Thunderbird before 1.5.0.4 allows remote attackers to cause a denial of service (crash) and possibly
    39Monitor
  • ← EarlierCVE-2006-2782Jun 2, 2006 · Firefox 1.5.0.2 does not fix all test cases associated with CVE-2006-1729, which allows remote attackers to read arbitrary files by insertin
    18Monitor
  • Later →CVE-2006-2784Jun 2, 2006 · The PLUGINSPAGE functionality in Mozilla Firefox before 1.5.0.4 allows remote user-assisted attackers to execute privileged code by tricking
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:mozilla2:1.7.8-1sarge7.1 · Debian:3.1Package registry (OSV)
debian:mozilla-firefox1.0.4-2sarge9 · Debian:3.1Package registry (OSV)
debian:mozilla-thunderbird1.0.2-2.sarge1.0.8a · Debian:3.1Package registry (OSV)
debian:thunderbird1.5.0.4-1 · Debian:12Package registry (OSV)
red hat:devhelp0:0.10-0.2.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:seamonkey0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-chat0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-debuginfo0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-devel0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-dom-inspector0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-js-debugger0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-mail0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-nspr0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-nspr-devel0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-nss0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)
red hat:seamonkey-nss-devel0:1.0.2-0.1.0.EL3 · Red Hat:enterprise_linux:3::asPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

    If successful

    Confidentiality
    none
    Integrity
    P · data or configuration can be modified
    Availability
    none
    Attack complexity
    M
    Confidentiality impact
    None
    Integrity impact
    P
    Availability impact
    None

    Weakness class (CWE)

    CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

    CVSS vector

    AV:N/AC:M/Au:N/C:N/I:P/A:N

    nvd-primary

    Root cause

    User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

    The bug in code

    The whole CWE-79 class

    A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

    Vulnerable

    ts
    commentEl.innerHTML = comment.body;

    Fixed

    ts
    commentEl.textContent = comment.body;

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    ATT&CK techniques

    —

    Change log

    1. Fix✗ → ✓

    For records you follow, these changes also arrive as notifications. →

    References

    Show all references (19 more)

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records