Mozilla Firefox up to 151.0 on iOS RTL ui layer

CVSS Meta Temp Score
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CTI Interest Score
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4.7$5k-$25k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 151.0 on iOS. It has been classified as problematic. Affected by this issue is some unknown functionality of the component RTL Handler. The manipulation leads to ui layer. This vulnerability is documented as CVE-2026-9078. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 151.0 on iOS and classified as problematic. This issue affects an unknown code block of the component RTL Handler. The manipulation with an unknown input leads to a ui layer vulnerability. Using CWE to declare the problem leads to CWE-1021. The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain, which can lead to user confusion about which interface the user is interacting with. Impacted is integrity. The summary by CVE is:

Firefox for iOS displayed specially crafted right-to-left (RTL) and internationalized domain names (IDNs) incorrectly in link preview UI surfaces. A crafted RTL hostname could visually reorder portions of the displayed domain, causing attacker-controlled sites to appear as trusted origins. This vulnerability was fixed in Firefox for iOS 151.1.

It is possible to read the advisory at bugzilla.mozilla.org. The identification of this vulnerability is CVE-2026-9078 since 05/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 06/01/2026).

Upgrading to version 151.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-31693) and CERT Bund (WID-SEC-2026-1668). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Mozilla Firefox

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 5.4
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Ui layer
CWE: CWE-1021
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 151.1

Timelineinfo

05/20/2026 CVE reserved
05/25/2026 +5 days Advisory disclosed
05/25/2026 +0 days VulDB entry created
06/01/2026 +7 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-9078 (🔒)
GCVE (CVE): GCVE-0-2026-9078
GCVE (VulDB): GCVE-100-365531
EUVD: 🔒
CERT Bund: WID-SEC-2026-1668 - Mozilla Firefox: Schwachstelle ermöglicht Darstellen falscher Informationen

Entryinfo

Created: 05/25/2026 17:39
Updated: 06/01/2026 10:15
Changes: 05/25/2026 17:39 (57), 05/25/2026 20:38 (1), 05/26/2026 13:24 (7), 06/01/2026 10:15 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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