How severe is CVE-2026-81267?

CVE-2026-81267 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2026-81267 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-81267?

CVE-2026-81267 affects Mozilla Firefox Mobile. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-81267?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-81267 published?

CVE-2026-81267 was published on 2026-08-31 and last updated on 2026-09-03.

CVE-2026-81267

CVE-2026-81267 is a medium-severity vulnerability in Mozilla Firefox Mobile with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-451.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-451
Affected product: Mozilla Firefox Mobile
Published: 2026-08-31
Last modified: 2026-09-03

Description

A malicious webpage could stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to render attacker-controlled content. This vulnerability was fixed in Firefox for iOS 155.0.

Frequently asked questions

What is CVE-2026-81267?: A malicious webpage could stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to render attacker-controlled content. This vulnerability was fixed in Firefox for iOS 155.0.
How severe is CVE-2026-81267?: CVE-2026-81267 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2026-81267 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-81267?: CVE-2026-81267 affects Mozilla Firefox Mobile. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-81267?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-81267 published?: CVE-2026-81267 was published on 2026-08-31 and last updated on 2026-09-03.

References

Affected products (1)

cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:iphone_os:*:*

More vulnerabilities in Mozilla Firefox Mobile

CVE-2012-1126 — Critical (CVSS 10.0): FreeType before 2.4.9, as used in Mozilla Firefox Mobile before 10.0.4 and other products, allows remote attackers to…
CVE-2026-84135 — Critical (CVSS 9.8): Other issue in Firefox Focus for Android. This vulnerability was fixed in Firefox 155.
CVE-2023-49060 — Critical (CVSS 9.8): An attacker could have accessed internal pages or data by ex-filtrating a security key from ReaderMode via the…
CVE-2022-26486 — Critical (CVSS 9.6): An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape. We…
CVE-2012-1144 — Critical (CVSS 9.3): FreeType before 2.4.9, as used in Mozilla Firefox Mobile before 10.0.4 and other products, allows remote attackers to…
CVE-2012-1142 — Critical (CVSS 9.3): FreeType before 2.4.9, as used in Mozilla Firefox Mobile before 10.0.4 and other products, allows remote attackers to…

All CVEs affecting Mozilla Firefox Mobile →

Other CWE-451 vulnerabilities

CVE-2026-2634 — Critical (CVSS 9.8): Malicious scripts could cause desynchronization between the address bar and web content before a response is received…
CVE-2026-0907 — Critical (CVSS 9.8): Incorrect security UI in Split View in Google Chrome prior to 144.0.7559.59 allowed a remote attacker to perform UI…
CVE-2026-0906 — Critical (CVSS 9.8): Incorrect security UI in Google Chrome on Android prior to 144.0.7559.59 allowed a remote attacker to spoof the…
CVE-2025-8043 — Critical (CVSS 9.8): Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in…
CVE-2026-11175 — High (CVSS 8.8): Incorrect security UI in Messages in Google Chrome on Android prior to 149.0.7827.53 allowed a remote attacker to…
CVE-2026-11172 — High (CVSS 8.8): Incorrect security UI in Contact Picker in Google Chrome on Android prior to 149.0.7827.53 allowed a remote attacker to…

Browse all CWE-451 vulnerabilities →